Stan,
I'm very happy with a recent switch to the Moe method. Go to moenormangolfacademy.org, click on Online Instruction, then page down to click on Concepts, Equipment, Aim, then Greenside Bunker Shots video.
Somewhere in there you will be asked to logon, or register if you have not already. It's worth it, IMO.
Then go back to the Moe's Short Game section and view his Bunker Shot video.
It is not an easy site to navigate but the info is there. Please notice in Ken Martin's video how he does not let the clubface turn over in the follow through. In my short experience, this is a critical element. Hit behind the ball, drive the club down and forward, and don't let the club turn over. This method is silly easy.
Of course they are advocating the Sandy wedge. I can see it might be helpful in the very fluffy sand they are using, especially in the Ken Martin video. I've been playing in midsummer hard/thin sand. I'm using the Golfworks 1.62 UC 60 degree wedge that I linked to earlier in the thread. I've actually bent it to 62 degrees to add some more bounce. Today a box will show up with some other similar Golfworks heads so I can experiment.
The wide sole with a good bit of bounce angle makes the shot quite easy. You have the Slider so you can make that do the same thing. Although, I do like the 60* much better than 56* for this shot.
Oddly enough, learning this motion has helped me with a "conventional" sand shot. I no longer feel I have to make a big swing when using that method. I just open the clubface and the stance, and make a similar move through the ball. I will need this in deeper sand, I think. I won't know till I get some good sand to try.
You're just missing some simple aspect of the shot. Watch the videos and see if you can find it.