Dont overthink it, I've had a bunch of combinations on my car - Locked, unlocked imrcs, stock gen 2 manifold, ported 2018 manifold -etc, it all feels about the same at the end of the day if its just a street car. Just keep it simple and work with your tuner
high volume tuners looking to keep up their margins over innovation is all this is, and thats OK. As more options for these cars become available and different setups keep evolving, new tuners who are willing to work with customers on more "custom" setups can get some market share and develop...
If you're absolutely certain that you wont want to push big power in the future, the G2 (120mm pulley, Lu47 injectors, and a Boost a pump) should get you to 600whp and be more responsive down low than a G3 at that power level. If you feel like you'll get the bug and want 800-850+ then might as...
I run Brisk RR12S at .026 gap on E85 and 15lbs of boost - tuner says logs are great. Cars been down the 1/4 mile, 1/2 mile, and regularly raced/driven on the street
Is your PCV catch can sealed or vent to atmosphere? Is the PCV check valve still in place? Might help if you show how everything is plumbed in the engine bay with another pic
you can reuse the stock bump stocks and trim them or purchase the ones from pedders but you'll need to confirm the diameter of the strut shaft as they offer different sizes.
Im sure you can email them direct and they will let you know which to order