Right. Don't worry about it. You'll get what you get.
I don't see it as a "problem" but more of an unknown, for you. Don't worry about it.
I don't see how it would help out in your case at all, no.
But... my riser is powered by a single Behringer Europower 4000, bridged to a 4ohm load (two 8ohm drivers in parallel).
My entire front sub-bass system is power by a single Cerwin Vega CV5000 running stereo 2ohm.
The two rear subs are powered by a single Behringer iNuke 4-6000, bridged to two 4ohm loads.