If you're looking to specifically add strength and size to you upper pecs, then I'd say switch both benching workouts to inclines in your next cycle. You can always go back to both being flat in the following cycle if you want.
However, if you're wanting to still try and make progressions in your flat bench, keep the Monday flat and do inclines Friday, sticking with the 5x5 parameters.
That's just my opinion.
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