Have you tried doing just flat bench 5 x 5 once a week? Sometimes less is more. Try them ramped, only the last set at your 5RM, the first set at 60% and the rest evenly spaced.
You mentioned pump and burn, neither of which contributes to strength or size.
If your shoulders are stronger than your chest than it is natural that they will take the load off your chest. Decline bench would solve that issue.
Stu
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