I got some critique on my drive last year and it immediately had a huge impact on the accuracy and distance of my drive. In May this year I was consistently throwing line drives 120 meters around 400' and more and throwing big distance high turnover shots I was getting my Champ Bosses and Star destroyers out to 140 meters (not every throw!) I then thought to myself, oooh I want a bit more distance, started trying different things and have in the last couple of months shot my form to pieces!
I have tried going right back to basics and trying to rediscover what I did last year that was so succesful and I think I'm starting to get back on the right track again now. Below is some video from 2 weeks back right at the worst point my driving has been for a year, I was struggling to get over 90 meters at this stage (about 300') Please can you see if there is anything obvious in this that you are seeing that has thrown me out. I think a large problem has been getting my weight over the disc. With my longer turnover high drives I think I have been having a tendency to shift the weight backwards and I have taken this into the line drives which have gone to pieces (i've still been able to throw long drives on a high turnover line) . Getting the weight forward is certianly helping and last night I was throwing line drives out to 110 meters again, but not with the same accuracy and consistency as before.
I will take some more video shortly.
Side on
http://www.youtube.com/watch?v=myAmWO6ceHU
From behind (different throws from the side on ones)
http://www.youtube.com/watch?v=6TTXj_W7ndo

