I have an RV6 with 180 and a fixed pitch propeller. What I can tell you is that the propeller that Vans supply for that engine is a very special version of the
Sensenich. The prop is effectively a clipped tip version but incredible high pitch.
It is 72 inch diameter, but 85 inch pitch !!!!! compare that with a PA28/180 fixed pitch which is 60 inch pitch or a Robin 400/180 that is 64 inch pitch. What it means is that you still get good full power static RPM at 2,300 rpm due to the clipping and 1,000 fpm climb rate and 150 kts at 2,400rpm. So why on earth bother with a VP prop and the costs of maintenance and rebuilds. On the 160 engine the VP makes a little bit more sense. The RV with the 180 is more nose heavy than the 160, so the VP makes it worse. Keep it simple, tip forward canopy to get to the back of the instruments and better visibility, less air noise.
Of course the wheel at the back not the front !!!!!