Cfair, 300' straight with 10' height is exactly what I'm shooting for when I rip my Comet through the tunnels at Shelby Forest. I personally use a modified power grip until I get up to my Teebird. For the Comet only, I have a slight right rear of the tee pad to left front anny approach, but huck it long and straight off the tee. That's probably not the best form but show me another disc that will go 300' with the slow, straight, no fade control of a Comet and I'll buy one. My point is I figured something out that I can do consistantly. I agree with what the others have written, don't give up on it (at least not totally), it flys more lines than any one of my other discs.
Also, I was right to trust you about getting the new ESP Limited. I played singles with it today and the Z will be left at home next time.