The below formulas work seperately but I need to combine them and everytime I do I cannot get them to work together.  Can someone please help?

if(contains( Product2.Name ,"Front Load Recycle"),if( Price_Per_Yard__c >2.00,"A",if(Price_Per_Yard__c<2.00,"B","B")),Null)

if(contains( Product2.Name ,"Front Load Waste"),if( Price_Per_Yard__c >6.00,"A",if(Price_Per_Yard__c<5.00,"C","B")),Null)

Who has experience with this app? I am using it to sychronize opportunity product custom fields with quote item custom fields. It works fine however I as soon as the custom fields work with default values, validation rules, workflows I get error messages...  Can anybody help? - Thanks in advance. Reto