Yes, waiting for the new 15-min low means a later entry. However, I've found that the 15-min low confirmation increases the probability that the reversal occurs. If you go in too early on a new 5-min low, often it can squeeze you (ETSY did this yesterday and almost hit HOD before dropping). With experience, you will get better at gauging when it is ok to jump the gun.
Your MU trade was great. It bounced off the MA and then hit the VWAP at noon. Really strong stocks will often find support off the MA's during their descent.
JD basically bounced off the VWAP. As with any chart, MA's and levels are areas +/-0.05-0.10 and not exact points. I use limit orders a few cents away from targets to increase the likelihood of getting filled.
AAPL made a nasty pullback and new 15-min high before losing VWAP. This kind of move is typical; it's like a giant, slow-moving reverse ABCD.
For the reversal strategy, you need to use loose enough stops and give the play time to work out. This may not suit a lot of trader's styles or personalities. It took me awhile to improve my patience and learn to trust the charts. Cheers.