RE: Don't stop at walk back
You can usually detect it right at the beginning when checking a bare shaft through paper.
If you have to really make wierd adjustments to the rest to get a good tear,there are probably other issues.Such as spine and/or torque.
If an arrow is too weak,the whole process will be tough.
If the arrow is too stiff,there shouldn't be any problems with the walk back or group tuning but the tear MIGHT be bad.But with the proper spine,you should be able to get a little tighter.
I use a program to get the right spine and that has eliminated most problems associated with spine.