Trying to get it to redirect to the Fact Finder tab. Can anyone see what I have done wrong?

This is my extension:

public class extSaveButton {
 
    public Fact_Finder__c fac {get;set;}
    public extSaveButton(ApexPages.StandardController controller) {
        this.fac = (Fact_Finder__C)controller.getRecord();

    }
    
    Public PageReference saveFactFinder(){
    
        insert fac;
        // Send the user to the detail page for the new account.
       PageReference pageRef= new PageReference('/apex/DestinyAccountTest?id='+fac.account__c+'&Sfdc.override=1');
        pageRef.getParameters().put('tab','tabFactFinder');
        return pageRef;
    
    }

}

 This is my Fact Finder record creation page:

<apex:page standardController="Fact_Finder__c" extensions="extSaveButton">
    <apex:form >
        <apex:pageBlock >
            <apex:commandButton value="Save" action="{!SaveFactFinder}"/>
            <apex:pageBlockSection >
                <apex:inputField value="{!Fact_Finder__c.Name}"/>
    
                <apex:inputField value="{!Fact_Finder__c.Account__c}"/>
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>
    
    </apex:page>

 and this is my main VF tabbed account page:

<apex:page standardController="Account" extensions="myFactFinderExtension2" showHeader="true" 
tabStyle="account"  >
<apex:includeScript value="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"/>
<apex:stylesheet value="https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/themes/ui-lightness/jquery-ui.css"/>
<script>
$j = jQuery.noConflict();
function highlightElem(elem){
$j(elem).parent().parent().parent().find('tr').removeClass('ui-state-highlight');
$j(elem).parent().parent().addClass('ui-state-highlight');
}
</script>

<style>
.activeTab {background-color: #892034; color:White;
background-image:none}
.inactiveTab { background-color: #00204E; color:white;
background-image:none}
</style>
<apex:tabPanel switchType="client" selectedTab="{!BLANKVALUE($CurrentPage.parameters.tab,'AccountDetail')}"
id="AccountTabPanel" tabClass="activeTab"
inactiveTabClass="inactiveTab">
<apex:tab label="Details" name="AccDetails" id="tabdetails" >
<apex:detail inlineEdit="True" relatedList="false" title="true"/>
</apex:tab>
<apex:tab label="Contacts" name="Contacts" id="tabContact">
<apex:pageBlock title="Hello {!$User.FirstName}!">
You are displaying contacts from the {!account.name} account.
Click a contact's name to view his or her details.
</apex:pageBlock>
<apex:pageBlock title="Contacts">
<apex:form >
<apex:dataTable value="{!account.Contacts}" var="contact" cellPadding="4"
border="1">
<apex:column >
<apex:commandLink rerender="detail" oncomplete="highlightElem(this);">
{!contact.Name}
<apex:param name="cid" value="{!contact.id}"/>
</apex:commandLink>
</apex:column>
</apex:dataTable>
</apex:form>
</apex:pageBlock>
<apex:outputPanel id="detail">
<apex:detail subject="{!$CurrentPage.parameters.cid}" relatedList="True" inlineEdit="True"
title="false"/>
</apex:outputPanel>
</apex:tab>

<apex:tab label="Fact Finder" rendered="{!$ObjectType.Fact_Finder__c.Accessible}" name="FactFinder" id="tabFactFinder" >
<apex:pageBlock title="Hello {!$User.FirstName}!">
You are displaying Fact Finders from the {!account.name} account.Click a Fact Finder to view its details.
</apex:pageBlock>
<apex:pageBlock title="Fact Finder" >
<apex:form >
<apex:outputlink value="/a7Q/e?CF00N90000006BaAp={!Account.name}&CF00N90000006BaAp_lkid= {!Account.id}">Create New Fact Finder</apex:outputlink>
<apex:pageBlockTable value="{!account.Fact_Finder__r}" var="Fac" cellPadding="4" border="4" >
<apex:column headerValue="Fact Finder" >
<apex:commandLink rerender="details" oncomplete="highlightElem(this);"> {!Fac.Name}
<apex:param name="Fid" value="{!Fac.id}"/>
</apex:commandLink>
</apex:column>
<apex:column value="{!Fac.Employed_Since__c}" />
</apex:pageBlockTable>
</apex:form>
</apex:pageBlock>
<apex:outputPanel id="details">
<apex:detail subject="{!$CurrentPage.parameters.Fid}" relatedList="False" inlineEdit="True" title="false"/>
</apex:outputPanel>
</apex:tab>

 This is my FactFinderExtension2 - Not sure if it is relevent, it is for attempting to upload an account attachment...it is not redirecting properly either..but it may be conflicting or something.

public class myFactFinderExtension2
{
private final Account webAccount;
public myFactFinderExtension2(ApexPages.StandardController stdController)
{
webAccount = (Account)stdController.getRecord();
attach = new Attachment();
}


public myFactFinderExtension2(){}
public PageReference saveAccount()
{
PageReference p = Page.FactFinder_Attachment_Notes2;
p.setRedirect(true);
return null;
}
public PageReference save()
{
PageReference p = Page.FactFinder_Attachment_Notes2;
p.setRedirect(true);
update webAccount;
upload();
return null;
}
public String parentId {get;set;}
public Attachment attach {get;set;}
public ApexPages.Pagereference upload()
{
attach.ParentId = webAccount.Id;
insert attach;
return new ApexPages.Standardcontroller(attach).view();
}

}

 Any help or advice would be much appreciated.