A3M2 NATO - Torque spec for top rail?

Bought an AUG (A3M2 in NATO config), took it to the range once and my LPVO came loose on the rail. No big deal, re-torqued it with loctite.

2nd range trip, and the optic is still tight on the rail, but the rail has now come loose. I see the three T30 screws to tighten it from inside the reciever (which are completely loose right now), but there's no torque spec listed in the manual or that I could find online. I have seen 40 in-lbs mentioned here and there for aftermarket rails. I assume 40 in-lbs + blue loctite would work, but i reallllllllyyyy don't want to strip the threads. Still waiting for a response from Steyr (think they were closed last week?), but I figured that I would pop in here and ask for advice.

Thanks in advance for any help!