I didn't experience slipping with mine, but I did find that the tolerances were visibly off when I set my lapping bar in there...so I lapped mine(I recently replaced it with a Larue). You might have low surface contact. Sub 10% and you'll slip despite proper torque.
Also, don't use loctite. No glue is necessary, and even if it was, loctite is way too thin.
What in/lb are you torquing your screws to?
I use liquid electrical tape....but its not necessary. However, no way anything can ever slip with that stuff holding it in.....that said, liquid electrical tape will grant you visual evidence of slippage(it will tear) and let you know you have something wrong. Starbrite is the best brand I've found. Thin but dries up hard and comes off clean.
Most people use nothing, and its fine....that said, most people haven't mounted dozens of scopes in crappy 10 dollar rings that need lapping but don't get it. If you have a situation like that, gluing in the scope can help tremendously....in fact a lot of gunsmiths do glue their rings. That's where I found this trick out from with the liquid electrical tape. A local smith. I'd also point out that the spuhr mount has ridges to increase efficiency when gluing, as promoted on their website...and Spuhr is about as good as you can get, mountwise..So while its not common practice to glue in your scope, it is a thing. My savage came with a cheap Bushnell, and they glued it in with regular electrical tape....