I've read the thread, but I don't commit every poster's minor comments to memory. Please, forgive me.
FWIW, how is the grip different enough to lessen any shoulder strain? You're still doing the exact same movements with the exact same stances and using your arms the exact same way. I mostly hold the PC by the body with my right hand, and guide it and apply downward pressure with my left on the cowl. The grip on this Chinese tool looks to be positioned the same as the PC's body, the only difference being its girth and shape. I can't see grip being the issue in your case.