hmm that sounds interesting...will all optifit weight's fit all drivers? (Razr fit vs. Razr fit Extreme)
Yes. Last season Callaway released a set of the optifit weights but a lot of the people that I know, settled on a certain combination and the rest simply sat there and remained unused. The other thing is with last year's set, the heaviest weight in the pack was 10g. I am not sure how significant it would be compared to the 13g.
Personally I play the "S" setting. I was getting either a slight draw or a bigger one (~20-25yds) depending on the weight configuration (neutral or draw biased). This is my natural shot shape with either irons or woods. However my body seemed to subconsciouly compensate for this since after about a dozen shots or so, in the draw biased setting, the size of the draw became noticeably less. Perhaps at the time of tinkering, I hadn't had enough time with this club yet but the weight setting did not have as big a difference on my ball flight as I though it would. Incidentally, I tried a 3g weight also but the difference felt negligible.
Anyway after that, I thought it would be safe to go for the heaviest optifit weight I could get my hand on. Honestly speaking right now, I am so happy with it that I am unlikely to change anything any time soon.