i have not come across this problem with that amount your saying 2-3mm ( thats huge ) 0.07mm- 0.15mm is std endfloat .i measured 3 new sets of main thrust bearings, on there own not fitted in block.
they measured - 1.060'/1.063' or (26.924/27.00mm). hope this helps.cheers

well picked up jmac thanks