"Still have problems though getting that spin that propels it the 300 plus feet. Still a little confused on how that works.Guess I will try to snap the wrist a bit more"
This really is the key to breaking the barrier. Sometimes visualizing a similar motion from a different activity when throwing helps to make a mental connection. Mark Ellis states that he basically adapted a raquetball "kill shot" to make his FH work. He also noted that another guy on the Discraft video looks like a 3rd baseman throwing to first when he drives. Other posters have related the FH motion to skipping a rock, reverse drawing a pistol and even slapping a midget. I have a couple that I use to help focus on generating better wrist snap. Sometimes I visualize that I am throwing a knife but adjust the motion to sidearm rather than overhand (grip adjusted for dg of course). Other times its chopping a tree with a hand axe. Either activity requires a lot of wrist action to perform correctly so in theory, it should translate when making a drive with a disc. I'm certainly not an expert in the realm of creative visualization but it does seem to help get me back on track when I feel my form is deteriorating.
Also try to keep in mind that the wrist snap is really the only explosive part of a FH drive. Everything up to that point should be an exercise in gradually increasing, controlled acceleration. In fact explosive may be too aggressive a term--its really more like the end of the whip concentrating the release of energy from the advancing wave of the whip.
Keep at it--it will fall into place, it just takes time. It is also a work in progress. The minute you break one barrier you'll hungry for the next.