Back to the topic at hand...........
Something i have been doing recently is kind of similar to pre exhausting the pecs before a pressing movement. What i do is 4 sets of flat flies then after those 4 sets, 4 sets of flat bench (preferably dumbbells) and do the same with inclines. I lost no strength on my presses and i felt my chest getting 'worked" a lot more than normal. Seriously, give it a go.