Hey there Extreme 3D Pro + Keyboard buddy.
Making the displays SOI is fairly simple. Left display is holding 'h' Right display is holding 'k' Hud is holding 'u'. The displays will have a green border annd the hud an asterisk when set as SOI.
When the hud is SOI, page up and down will cycle your weapon profile. If all it does is change what the reticle looks like, you're in guns mode so press 'm'.
With the Mav profile selected your mavs will be in weapons mode, so hold k to make the right display active and you can use ,./; to slew around and find your target.