Birdie here. I have an PittsS2B and had the same problem with reaching the rudders even with Aviat's rudder extenders. Bill Fingan has solved the problem with his rudder extenders that can snap in/out with ease for those who need them and for those who don't. Gone are the layers of cushions. Have full stick deflection to boot. Just putting this out there for anyone who has desire to fly a Pitts but has issue with reach. Bill Finigan's hanger #, by the way, is 410.956.0047.
If we're ever at a contest together, you're welcome to a ride in my Pitts.