I have G2 with Steam version of DCS. You can remove the command line now as MT Preview does it for you.
Make sure you have latest version of OpenXR Toolkit, 1.2.4 think. Run reprojection from there.
I'm on i7-10K 32gb ram 3090 and reverb g2.
On medium or high preset I seem to mostly be GPU bound. I can get around 60fps but it's jerky. I have to switch on OpenXR toolkit reprojection which helps but not amazing.
On WMR + G2 I on about 72 FRP (was 50-60) but it's got loads of micro stutter so needs reprojection but, when you turn it on in OpenXR Tools, DCS crashes at the main menu.