i like. i just did the same and went for a minimalist look too with a pile of rocks on the right and a larger pile on the left. i like the look of the white sand all exposed. i ended up throwing the rest of my live rock into my sump. i placed my powerheads sort of hidden but not really by the rockwork.
i had the same problem that you had with the flow not being the same, so what i did was i "crossed the streams" ghostbusters style! with 2 powerheads on the right pile of rocks. this worked better, although i do have a single vortech above the left pile of rocks. interestingly, even if the powerheads aren't "hidden" per se behind the rock piles, they sort of blend in.