Well the last one I posted is drastically different than my first. I'll say that much. I have a TERRIBLE habit of downswinging. I always feel like it's fixed until I record my self. I start my hands down and somehow I still bring them back up. Most of my swings are a downward chop. Super annoying. I see what you mean with the stride. It goes forward but stops short and comes down backward some (I can see it with my foot) that's what you mean right?
Exactly. You start out with a great stride but it's almost like you subconsciously say "Oh crap I'm gonna saw myself off" with regards to how deep in the zone the ball is going to be placed and then bring your stride backwards to make up for it.
As for the "downswing" habit, part of that is just because the ball is going to be below your shoulder so your swing path is going to be "down" based on where you're standing in relation to the tee (if you played the tee another foot in front of you in this video, you'd probably be catching the ball on the upswing instead of pretty much level like you do in the most recent video--which is still going to lead to a lot of line drives).
If you can, what I'd recommend doing is taking a video of 10 swings at regular speed and posting them, and then taking the same video and turning it to slow-motion on the 2-3 swings you think are the best, and the 2-3 swings you think are the worst. Take notice of the differences in the mechanics of those swings. Do you have the same stride length? The same load? The same hip rotation?
That will help you pinpoint your inconsistencies and give you a good idea on what you need to focus on.