First of all I'm 140 pounds and 5'10". I normally paddle a kingpin 6.1 and love that boat but lately I have been wanting a fraidy boat for class IV rapids. The kingpin gets pushed around a lot! I picked up a Dagger GT 8.1 at an incredible price and in great condition. I can roll my kingpin without a problem in most situations but my roll with the Dagget GT 8.1 is weak. Is there a point where too much volume makes a roll very difficult or do I just need to brush up my technique.