I tune the mast the same way:
1) Mast step forward, forestay at max length, center the mast tip using a halyard, etc
We do not however, block the mast in front pushing it aft as far as possible. But my guess is that if you crank down on the uppers before you block the mast from the front, the pre-bend is already in the mast from mast tip to step and you won't take it out from the partners down to the mast step by blocking in front of the mast. By blocking the mast from the front after tuning, one might reduce mast bend below the partners when applying backstay tension. Is my thinking wrong?
