Do you play heel toe? Doesn't sound liek it, so don't practice heel toe till you have it down...whatever other way you play, flat foot/jazz or heel up/rock. By 16th triplets...you mean sixlets? Always confuses me when people say 16th triplets. If you are talking about sixlets,...well play triplets/slower sixlets, either count em like a triplet or sixlet doesn't really matter, only difference is sixlet has 2x the notes/is 2x as fast basically. I'm still trying to fit steady+constant triplets/sixlets with 8ths up top, but I just mostly play for fun now n just jam out I guess on the set. Mostkly just work on rudiments
Iono what it's liek learning from a DVD cause I've had a teacher and book for the past...8-9 years so yea. The quick snips of different videos I've seen...well I couldn't learn like that, I need someone beside me slowing everything down and answering my questions. But for the sixlets, just keep practicing while keeping a steady beat up top unless you're good at keeping tempo without a constant.