The more you rake your mast back, the more you have to rake your rudders under the boat. Drag is a problem I have right now with my set up in high winds. My rudders aren't raked under my boat enough and when the wind picks up it is like putting on the breaks. There is a way to measure both, but I can't remember where I saw them last. I've bought some new rudders (EPO's) and have found adjustable upper rudder castings so hopefully I will soon take care of this problem.

But someone with more experience than me may think that it is something totally different.