What am I doing wrong here?  I am still new to Apex but I followed the bulkifying code best practices to the best of my ability.  What is causing this code to hit too many script statements?

-Thanks

//Whenever a task record is inserted, updated, or deleted this trigger will look at all the task records 
//for first and last "contact date" of the related tasks and copy  to Contact Dates field of Account.
trigger CopyFirstContactDateToAccount on Task (after insert, after update, after delete) {
	
	//create a set of WhatIds for the tasks
	
    Task[] tasks = new Task[]{};
    Task[] tasksOld = new Task[]{};   
    if(Trigger.isInsert) {
        tasks = Trigger.new;
    } else if(Trigger.isUpdate) {
        tasks = Trigger.new;
        tasksOld = Trigger.old;               
	} else if(Trigger.isDelete) {
        tasks = Trigger.old;      
    	}
	
    Set <ID> setAccountIds = new Set <ID>();
    for(Task activity: tasks) {
        if(activity.WhatId != null) {
            setAccountIds.add(activity.WhatId);
        }
    }
    
    Set <ID>setAccountIdsToBeNull = new Set <ID>();
    for(Integer i=0;i<tasksOld.size();i++) {
        if(tasksOld[i].WhatId != null && tasks[i].WhatId == null) {
            setAccountIdsToBeNull.add(tasksOld[i].WhatId);
        } else if(tasksOld[i].WhatId != null && (tasksOld[i].WhatId != tasks[i].WhatId)) {
            setAccountIdsToBeNull.add(tasksOld[i].WhatId);
        	}
    }

	try {
    CopyContactDate(tasks,setAccountIds);

    if(Trigger.isUpdate && setAccountIdsToBeNull.size()>0)
        CopyContactDate(tasksOld,setAccountIdsToBeNull);

	}        
	catch (System.DMLException e) {
	     trigger.new[0].addError('Edit the related account in a new tab and correctly complete the required fields.');
	}
	
	/*--------------------------------------------------------------------------------------------------*/
    //this method will copy the minimum and maximum activitydates from the Task object to related Account
    private void CopyContactDate (Task[] activities,Set<ID> setAccountIdsSet)
    {
    	//create a set of OwnerIds from the related accounts
    	Set <ID> setOwnerIds = new Set <ID>();
    	for(Account acct: [select Id, OwnerId from Account where Id in:setAccountIdsSet]) {
        	if(acct.OwnerId != null) {
            	setOwnerIds.add(acct.OwnerId);
        	}
    	}
    	
    	//map the related completed tasks WhatId if the OwnerId is the same as the related account 
        Task [] taskAccts = [select Id, WhatId, OwnerId, ActivityDate 
        					from Task 
        					where Status='Completed' and WhatId in:setAccountIdsSet and OwnerId in:setOwnerIds];
        Map<Id,List<Task>> taskAcctsMap = new Map<Id,List<Task>>();		//map the task WhatId
        for (Task allTasks: taskAccts) {
            if(taskAcctsMap.containsKey(allTasks.WhatId)) {
                taskAcctsMap.get(allTasks.WhatId).add(allTasks);
            } else {
                taskAcctsMap.put(allTasks.WhatId,new List<Task>{allTasks});
            }
        }
        
        //mapthe related accounts
        Map<Id,Account> AccountsToBeUpdated = new Map<Id,Account>();
        
        //populate the contact date fields
        for (Task t: activities) {
            Date firstContactDate= null;
            Date lastContactDate = null;
            
            List<Task> taskAcctsMapTempList = new List<Task>();
            taskAcctsMapTempList = taskAcctsMap.get(t.WhatId);
            if(taskAcctsMapTempList != null) {
                for (Task bdcAccsMapTemp : taskAcctsMapTempList) {
                    if (firstContactDate== null) {
                        	firstContactDate = bdcAccsMapTemp.ActivityDate;
                    } else {
					if (bdcAccsMapTemp.ActivityDate<firstContactDate) {
                    		firstContactDate = bdcAccsMapTemp.ActivityDate;
						}
                    } 
                    if (lastContactDate == null) {
                        	lastContactDate = bdcAccsMapTemp.ActivityDate;
                    } else {
					if (bdcAccsMapTemp.ActivityDate>lastContactDate) {
                            lastContactDate = bdcAccsMapTemp.ActivityDate;
                       	}
                    }
                }
            }
            if(t.WhatId != null) {
                Account a =	new Account(id=t.WhatId);
				a.First_Contact_Date__c= firstContactDate;
       			a.Last_Contact_Date__c= lastContactDate;
				AccountsToBeUpdated.put(t.WhatId,a);	
			}
        }
        	if(AccountsToBeUpdated.size()>0) {
            	update AccountsToBeUpdated.values();
        	}
    }   
}