i recently purchased a 915 D2 driver it has a diamana red 50 shaft. I live in a very rural setting no fitters even close. Small golf store about 100 miles from here suggested that shaft. Never felt right so I put a graphite design YS-6 in it much better. But I am left wondering is There still yet a better option. I have a swing speed between 86-93 mph am a good ball striker, average drive is 239 total. Any suggestions?