I've written about my BB30 experiments in other threads (search).
The loctite works OK for a while. It is an improvement, but eventually it breaks free also.
It only requires a miniscule amount of microscopic motion under load to create clicks, groans, & squeeks in metal to metal contact that echo through hollow carbon frames.
The fundamental flaw (IMO) in BB30 is that they typical wave-washer installation does not create a stiff-enough lateral clamping force on the bearings, giving a slight side preload.
Note how a Hollowgram crank puts a very slight side preload on its bearing, but then RIGIDLY CLAMPS the crank arm in place so there can be no subsequent motion. I have never had a problem with a Hollowgram crank.
So, for example, I got my 2010 FORCE cranks to be quiet for a long time by completely removing the wave washer and just selecting a build-up of the thin plastic washers to just take up any side-play while leaving a very slight side preload on the bearing. But this is a bit risky because if you get too much side load you can damage the bearings.
I now have a 2013 RED crank, and its "preload adjuster" is a step in the right direction and seems to work ok. But even it got loose on me once already, leading to creaks and pops. The mistake is that it is made out of plastic, which just isn't robust enough. They should have made the preload adjuster of aluminum.
I am on the lookout for a "split ring shaft collar" like in the picture, but it has to be only 5-6mm thick, so I haven't found one yet.
I am pretty sure that if I found one to fit the 30mm BB30 shaft, and it was thin enough to replace the "preload adjuster" it would hold things in place much better.