Items with stat bonuses +28? DO WE DARE???

I can't get it to work any way other than the inefficient way I first tried it---I have no idea why.

Instead of moving the INC +1 and the CLC, I have to DEC -1 then INC and CLC after the ASL ASL.  When I look at how the bits should be effected, it seems like I should instead put the INC before the ASL, and I'm not even sure why we CLC.