[tewall]

There's no way calling down a good hand, like the ones you mentioned, against turn-raises can be a leak. Folding can be a huge mistake in this situation, but calling cannot be. You don't have to be ahead much at all for calling to be correct. Say you only need to be ahead 10% of the time to make calling correct, and you actually win 15% of the time. This means folding is a profitable play, but in actual playing experience you will be losing about 6 times for every time you win. So it will seem like "every" time you play AA and get check-raise you get beat and you should fold. But that's not true; calling is the right play, even though it seems like you're getting beat.

On the AK follow play, only if the conditions were ideal would following through be advisable IMO. Ideal would be at most one or two opponents, and the opponents are not calling stations and not aggressive. This probably isn't much of a leak either if you just continue on the flop. If you keep pushing it then it could be.

Something I noticed you didn't mention in your question is pot-odds. This is a vital matter, and the fact that you didn't mention it is troublesome. Not just for AK hands, but for all hands it's necessary to know the pot odds, as the correct play varies greatly depending on whether the pot is big or small and how many players are in the pot.