From reading this and other forums on Sheiko, there appear to be a few general thoughts. The first is that the bench percentages are too low, and the second is the GPP for the back and shoulders needs to be included somewhere.
The solution is to increase the Max Bench numbers by 5% and run all the %'s off this number.
For back and shoulder exercises, I thought that including a GPP saturday in program 29 would solve a few problems. I'm not preparing for a competition, so I'll use the 29 template which is 3days/week of training; monday wednesday and friday. GPP would be a few rotator cuff exercises like push ups, face pulls etc, done at a low volume and intesity.