I can tell you both Bob and Warren put in a lot of time at the range testing and practicing to shoot those scores. They are great shooters and their scores reflect that.
As for scoring rings being smaller it may come to that one day. Bullets have come a long way in the last couple years with higher B.C. and the equipment has become better also. Although You can't take anything away from the shooter because shooting consistent high master scores is an accomplishment in itself.
I do believe with electronic targets there needs to be a delay put in place and I think that would be a start in the right direction. I shoot prone in a sling now but started out shooting in f class and have seen open shooters complete there string and Im only three shots into my string. They get a condition and shoot them as quickly as possible. There's no waiting on the puller to mark the target and run it back up.
Don't put a delay in the E T system. It causes problems when there are crossfires.