Hello F-L
Thank you so much for posting this. From my side, maybe just a few comments....
1) I never suggest using 1-piece mono mounts on large (non-LPVO) scopes as it does restrict where you can place the scope mount so as to not interfere with the turret housing.
2) With a set of 2-ring mounts, you have way more available "space" to place the mounts on the scope so you can get the proper eye-relief you need. Also, the Arken Rigid mount is a FORWARD LEANING cantilever, so it's actually pushing the scope 1-1.5" forward, sway from your face. These mounts were really designed for LPVO scopes.
3) They have a line indicating the "safe mounting area) - which is 18mm away from the turret housing, and 13mm away from where the turret housing starts to "flare out". With the Arken Rigid mount, when mounting on the "safe mounting line" on the tube forward of the turret housing, you only have 2mm on the rear tube before the turret housing starts "flaring open". So you're basically starting to "crimp" the turret housing.
4) And cheap torque wrenches have varying amount of actual measured torque from one tool to another - so sometimes you think you've got 18 in-lb of torque, and in actual fact it could be 20, 22, 24 etc. I have sent 5 different Wheeler Fat wrenches in for calibration over the past 4 years, and only ONE was 18.1 in-lb when set to approx 18 in-lb - the rest were 22, 23 and 24.5. So that too can damage or limit a scope's proper working.
5) Lastly, no scope manufacturer that I now of at least, has diagrams or documentation with specs of where to mount the rings. This Falcon is only of the only scopes I have ever sold, where they show a line on the underside of the scope, showing the "safe mounting distance" away from the turret housing.
6) And if a line on the turret doesn't line up 100% with the numbers, it's the angle of taking the video.
But you can clearly see there's NO slop on the turret, NO mushy-ness up or down - and very very audible.
F-L - I suggest removing the scope from the mount, and see if your turrets work better. My thought it your mount "pinched" the turret housing, possibly causing some of the issues. I check EVERY scope before I ship it out, and Nick Watts (owner of Falcon in England) also inspects every single scope personally before shipping them to dealers - that way, if a problem is found, he sends it back to the factory and obviously doesn't have to pay for that specific scope, and doesn't have costs with warranty etc etc. I did not find ANY of the first shipment to have any slop or mushiness on the turrets - I tested them all. And so did Nick - this leads me to believe it may be your mounts - too close to the turret housing and/or rings crews tightened too much - either accidentally, or by a torque wreng being out of spec. I don't use cheap torque wrenches anymore (except I have ONE Fat Wrench that was measured in a lab to have the correct calibration. I use Fix-it-Sticks or a $500 one from Europe - which has been properly calibrated. LOL
I just tested the 4 units I still have here in stock (unmounted), and they click very crisply, and there's no slop. Which makes me wonder if just maybe, the Arken Rigid mount you're using is causing some kind of issue with your turret housing - being mounted too close to it.
I have attached a photo of the Rigid Mount on the scope, where the front ring is AT the "safe install line" - and another photo showing how close to the turret housing the rear ring is - around HALF the distance it should be compared to the front ring.
I would suggest you both move to using RINGS, and not mono-mounts. And especially not forward-leaning cantilever mounts.