[BerubeJAM508]

Just my two cents worth...
S&S MR103 cams, bearings, support plate, oil pump, and adjustable pushrods, Feuling lifters, S&S power tune duals with slash cut mufflers, power vision tuner and target tune with wide band O2 sensors. This combination woke my '16 RG ultra right up. Pulls like a tractor and 120 mph is not a problem (although I don't recommend it).

I have the MR103 also- data and advertisement shows it as a balanced option.

Only advise would be as follows-
Keep drivability in mind- I find the MR103 in my setup is good all around, but really shines as a noticeable performance gain in the higher RPMs above 4250. Which is a place I seldom go on a daily ride.

That kind of high RPM WOT riding will wear those around you thin- fun but not practical.

I’d say look at a heavy torque cam, and focus on exhaust design to keep velocity. (My 103” at WOT at 6500 rpms with homemade 2.5” 2-1 only has a differential pressure from valve to tip of .05PSI! Actual pressure is higher, but it’s ideal and it’s not choked flow, Or anywhere close to your idea of ‘bad back pressure’

Velocity is king for that instant power at a wrist flick!! Many true experts and thoughts; in my case I experimented through iterations from real sensor data