In my experience the 2spd shoes wear a bit when new and new to be readjusted to keep your shift point consistent. After my first couple of race days I found my 2spd engagement to be shifting later and later like many others. Some rebuilt the assembly with 3rd parts springs but I simply tightened up my set screws until the shoes started to rub and backed them off 1/8 turn to return them to the fit the clutch had when new. I found that the 2spd shoes seemed to loosen up and shrink a hare when new. Readjusting everything after than 2 race day I have had consistent shift points ever sice.
Mark