Hi I bought a new headset and I'm getting same issues as you looking outside , Did you resolve your problem , I would say up the steamVR slider too 150% . With openXR try CAS . This will sharpen things an bit .
Also in system options AA x2 . You have good system .
But this DCS . Its an old graphics engine , Also the spotting in DCS is bugged if you go above 1080p res with 2k or 4k your have problems spotting , has been like this for years , your see lots of complaints about the spotting all over the internet .
I have a 4k VR headset and i have to drop my Resolution down 50% so i can see targets . Modern day jets we use radar to track .