The Torque on those setscrews , that dig into the eccentric, need not be that High, IDK the number .
the pits dug into the eccentric make further fine adjustments difficult.
as the set screw wants to return to the marks It already Made Before.

If you are getting a frame builder to replace the cracked aluminum Captain's BB shell why not eliminate those set screws entirely ?

See R&E Cycles Front BB inserts Bushnell eccentric ebb chain tensioner