The videos and books are all great without doubt but they both lack one thing, a human being that can stop you and tell you, hey that's good, or hey too fast, slow down.
That's true but as long as you do the exercises to a metronome, start slow and work it up, there's really no "too fast" or "too slow". I've seen where Mike Johnston and some of these young Berklee wizards talk about doing kick drum exercises until their leg is burning with pain. Obviously you don't want to injure yourself but you can take it pretty far...
A teacher is good though for a structured approach, and like you say for feedback, so I'm not trying to sway you from that path.
Meanwhile one thing I only recently discovered [somewhat to my shame :)] is inverted doubles, where you start with a single and put the accent on the second stroke of the doubles -
R lL rR lL rR lL
It's really cool and you can incorporate it all around the kit. Here's a great clip for inverted doubles, I've been working on the groove at 2:55 for awhile now, it's coming together and feels amazing to do -
[ame="https://www.youtube.com/watch?v=oxCNR3YKUsU"]Why Use Inverted Double Strokes? - YouTube[/ame]