You can't really go wrong with a SS rack (from Texas Strength Systems or a local fabricator), a SS bar from Capps Welding, and plates + collars from...
I've also had some success with cueing "hips back", "reach back with your hips", that kind of thing, in conjunction with Deborah's "knees out" angle....
First off, shoulder problems often show up during bench, but are caused by the squat. Have you posted a squat form check, with a specific request to...
If I'm not mistaken, doesn't combining whey and casein (if they're not isolates) basically mean you're re-creating powdered milk at that point? (And...