Surprised to hear it as I, with pretty much the same system only 10850K instead play in G2 VR and having a blast with it.
My only BIG issue and they are suppose to fix it is the stupid menu closing automatically which is a mega pain in the ass, but otherwise I experience no issues what so ever as far as performance goes.
Ye sit is annoying we cannot see the GSX messages like they appear to 2d users and the damn menu closing.. did I mention the damn menu closing. but yeah.. are you sure when you play in VR you do not have a blue bar on top of monitor telling you to press winkey+Y, set this to MANUAL you should never have to press WINKEY+Y it should always be OFF and set to manual (if I recall) that needs to be disabled I see so many people paying with this crap on this should be disabled, also you should run your MSFS in full screen mode as well (yes when in VR), last I can recommend is LOWER all of your 2d setting to bare minimum like you had a commodore.. yes it will look like crap in 2d but it will not grab resources that takes a while to free them to use by VR.. anyways I am having a blast with your PC I do not see why you should not !
Except for the stupid menu that keeps on closing in case I haven't mentioned it...
Andy