The mirror stem itself is threaded into the hole on the perch, or is there a bolt going through from the top like the New Monster mirrors?
Stem goes into a threaded/adjustable mount, the mount threads directly into the perch.
Though Ironically I was using some extenders that mounted with a bolt through them into the perch, then the mirror mount was threaded into the extender...
No idea how bad your stock shocks are but I see they offer the V7 Racer versions as an accessory. The stockers on my T-100 were essentially rigid and on the softest preload would kick me in the backside over any large bump or manhole cover. The Ikons are barely noticed.
They're relatively stiff, but not kicking me - but I'm not a small guy - 5' 10-11" / 225.
Funny that my old /6 BMW came standard with a built-in 3-position preload lever. We don't always get progress.
Some might call the threaded preload adjuster progress as the dual locknuts and couple of inches of thread allow for finer adjustments over the range, morso than a 3-position lever. HOWEVER, it also means that adjustments are more time consuming.
Loosen locknut, run adjuster nut to desired position, retighten locknut, measure distance of exposed threads, match adjustment on other side...