You don't *have* to add weight every time. Since you are doing an A B A B style workout 4x a week I would say should add 5lb once a week. Adding 5lb 2x a week will get to be far too much really quickly.
If your form is breaking down to the point where you are risking injury then do not add weight. It's always more important to keep your muscles and joints healthy rather than getting that next 5lb.
IW
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