I run #54194 in both my M05 and V2 at a fairly loose setting after trying the stiff setting everyone was raving about which did not work well on my tight track.

On one of them I used the Tamiya thread lock, one is using the HPI thread lock. Neither are loosening after 3months of almost daily driving. I've mentioned that I tried it in both orientations inside the gear box. No issue.
Also be very careful not to contaminate the threadlock with diff grease during assembly.
I ended up with the adjustment shaft on the left side just from a convenience point of view as I do adjust the diff if it's too tight by turning it maybe 1/4 of a turn ccw. I don't have this problem of it loosening inside the gear box further on its own to the point it slips or completely separates. And this is like my 40th or 50th car or over the yrs. I've built MANY ball diffs and it's not unusual for me to adjust the tightness of it.

And, as a real car hobbiest, I've also had issues of Loctite blue not curing after it's been on the shelf too long. I toss it if it's more than a yr old.

My M03 used the MantaRay ball diff. The splines on the pressure plate broke after maybe 5months of hard driving. I only plan to buy the #54194 from now on for my M-chassis as the pressure plate and cup is one piece.

Regardless, good luck at the races. It was not a smart-ass comment. I genuinely want you to do well at the races.