The gain of 30% (10-30%) in the 2080 ti is the same as in any other monitor game or VR headset, so Pimax does not use too much of those cards yet.
This "Compatible with parallel projections" check box has been known to testers for quite some time. It would have to be activated for games in which the image appears duplicated in both eyes, which happens in many of the games.
The Chek box "Hidden Area Mask" consumes quite a lot and only serves to fix artifacts that appear in a handful of games, I think that the artifacts were due to that some games, I suppose that to increase the performance, did not draw everything that was seen with the FOV of the Pimax, remaining black zones or with residual images.
The testers already recommended to Pimax that they would have to detect when each of the options were necessary and activate them automatically without the user having to do anything, or at least save the options for each game.