I am not sure about the strong option, but i just went from a 909D3 Voodoo stiff to a 910 project x7 stiff and my swing speed is 105-110. I just got fitted 2 days ago and traded in my old driver that day. I gained about 10-20 yards on average and my buddies think it is crazy and cheating, because now I am driver to wedge on alot of holes at our base course in GA. Oh and i also seem to swing about the same as you, nice little draw or a blocked right (which always frustrates me). Good luck and have fun.

Our rep does carry an HD6 in a std stiff, but if it you need something "stronger", it can be tipped up to an additional inch (1 1/2" total).  Give us a call at Team Titleist and we can try and find an account near you where you can try this shaft and others that might be suitable.   1-888-TITLEIST

Just got fitted for 910D3 8.5* HD6 x flex.  109 swing speed average with driver.  My miss is a terrible hook or block it right.

I love this shaft.  Havent gotten out to play with it yet, but been to the range twice.  It came down to the Diamana White vs HD6 in my fitting at a regional fitting center.  HD6 spin rate was lower on mis-hits (hooks) so that is what we went with.

If I can give you one piece of advice, do not short yourself on shaft choices.  Take the above advice and call Titleist to see if you can hit the HD6 and other shafts.  If you are considering upgrade shafts anyway, go hit as many of them as you can.  The shaft can cause you to hook, slice, spin at 4000+ or 1700 with the same head.  Don't settle for a shaft without hitting it.

I did actually go get fit for them about 3 months ago and loved the HD6 but they didn't have a "strong" flex option to demo and I didnt know if i could order one.  i decided to go with the RIP 60 stiff tipped 1" D3 9.5.  Can't wait for it to come in! And it saved me a $150 upcharge! Haha!