HMMMM it definatly doesnt sound like you are overpowering but there might be some concern that you are underpowering. You say between 5 and 7 #'s thats a big difference and the type of difference that may aid in making your plane respond the way you say it does. Over correcting on an underpowered plane could definatly react as you say your plane is. Especially if your CG is on. How about lateral CG thats ok?