I'd suggest shimming the backside of the mount arm with some electrical tape - it'll all be hidden once it's installed, but will eliminate the wiggle! Boring out the mount would work too, just requires a little more effort. I may start looking at including a shim of some sort in the kits, since this issue seems like it's not just isolated to my truck (which I initially assumed it was based on my very much not-factory totally glued windshield mount plate).
If you'd like one of the 'drop' brackets, just let me know! Perhaps @Carter2 can post up a picture of what it looks like once mounted? I'd love to see it installed too! This is what it looks like in CAD - you can see how it would drop the mirror downwards. I think the first person that used one of my mounts on the Tripro must have been fine with how the original bracket positioned it, as they said it worked great - so if there's an issue, please let me know!
In general on my G930 I found that positioning it like a normal mirror (i.e, where I could use it as a mirror with the screen turned off) was actually counter-productive - I'd get a ton out glare from the outside world bouncing off the mirror portion and muddying the displayed feed. I think I actually have my G930 display tilted up a smidge, so that it's 'looking' at the interior headliner, which prevents the display from trying to fight daylight-bright reflections coming through the rear window (which is a hard thing to do - the sun puts out a silly amount of light!).
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I actually think the camera clarity is great through the rear glass & I don't end up with any glare - this is a really silly question, but you don't have a fingerprint smudge on the lens, do you? I will say I used the 'double jointed' mount bracket that Wolfbox provides for the camera to 'extend' it to the rear glass, with may be why I don't get any glare.