Hi Rich, thanks for your message.
It's interesting to read how often people give stack and tilt a go, notice that their ball striking improves, then 5 minutes later are trying to incorporate it into their own swings... you'd think it might be worth giving it 10 minutes?
There's nothing wrong with adopting some stack and tilt principles into your swing, I'd say anything is better than getting stuck over that right foot hitting fat shots, that said there's more mechanics to Stack and Tilt than just getting your weight to the left, and all the parts should work together to produce the correct strike & ball flight.
A couple of things from your videos then...
let's start with your own swing....
You look like you have a little move going where you roll your wrists open on your backswing. The clubhead should try to remain square to the line of the swingplane or certainly a little more square than yours currently is.

If you watch your videos you'll notice that your driver clubface is very open too... and you might also notice this...

The overswing.
The reason that it's bad is because it is so inconsistent. Your hands will have to work overtime to get the club back to the ball, you've gone right across the line at the top so it's likely that you'll throw the club slightly over the top on the way down. As a result I doubt that you consistently get your weight through correctly. Tour players can hit the ball miles without needing to swing that far, you can probably do the same, it's in the mechanics.
With your driver there's a significant head drop down and away from the ball as your body instinctively tries to create space to get the club back to the inside..

Watch this clip of Jim Furyk, and stick your mouse pointer at the front of his head
http://www.youtube.com/watch?v=cTuTrpWCZhU you'll notice that his head hardly moves, again this is about consistency... all the good players have it. There wasn't a view from the front for your driver swing so I can't see what your weight was doing but it does look like it's falling off the ball.
You also take the club away very low, leading with the hands? Which brings me on to the stack and tilt pics....
When using stack and tilt you're not opening the club face nearly as much (which is good) but you can clearly see the move you have going here where you lead the takeaway with your hands - keeping the club very low below the swing plane...

Your club should stay more or less on the orange line (as demonstrated) and the clubface should remain squarer to the plane as a consequence of turning into the backswing instead of using the hands. There shouldn't be any need to excessively lift the club as it should naturally ascend on plane as your left shoulder turns down.
Your S&T swing does look a lot shorter, in control and compact.
Last thing is in the set-up.
During the stack and tilt swing you should be trying to stay over the ball, not in front of it. The center of your shoulders and the center of your hips should be 'stacked' over the ball ie: in a straight line. The conventional swing would have your spine angled 5-15° degrees to the right (not stacked). There is no need to pile all your weight/stance etc onto your left side. Stack and tilt advocates 55%/45% favouring the left side at address... not 70%/30%.
As you can see from this picture your shoulder center appears ahead of the ball. Although I conceed that the picture angle might not be perfect.

Personally I would try and stay with the stack and tilt basics and give it a chance. Sure you might not feel like you are necessarily ripping it but you should start making solid contact and hitting less wild shots as your repetition builds, after all you did say in your message that you were "striking the ball like a man possessed"
There's a few other things we could go into but let's see where you go with it over the next couple of weeks and whether or not you want to stick with it before stripping it to the bare bones

Hope this helps mate. Let me know accordingly.