Not sure if tight changes would make a difference or not. The 1st gear bearing support is hardened and ground material that the one way bearing rides on. It should be 1" in dia. The tolereance on this part is pretty critical for a good lock up of the 1st gear. What condition was this in? Also, how are the springs and shoes on the secondary clutch?
FYI.. I am in the process of rebuilding original secondary shoes. I have OEM clutch lining material, the adhesive used with correct brass rivets. Doing 2 sets now. Steel backing parts are out for re-plating. Using a NOS set as a guide.