Small plane, powerful motor... yeap it makes sense that you'll be needing more than 3deg.
I flew a Hydeout for a couple of years using rudder mix instead of right thrust.
I eventually decided to "F" the mix and build in 3 deg(ish of right thrust. The plane was, in my opinion, revolutionized!
Much happier, less critical and far less fussing about with micro % mixes.
Conclusion, if you ain't as advanced as CH... go the dumb-ass route.