Thanks Corners, I think I will try to demo a few racquets as you suggested using the TW demo program. Do you (or anyone else) have any thoughts on the Dunlop Aerogel 4D 200 Tour? I read a few reviews saying it felt like a more flexible 6.1 classic and the price is definitely attractive. And also, which of the newer 6.1 95 should I demo, there seems to be a few models (hyper pro staff and BLX)?
I haven't hit the 4D 200 Tour, so I can't comment on that one. It is definitely flexier than the 6.1 classic, though, by a mile. Lots of devoted 200 Tour players out there. But if you're looking to hit with a lot of spin be aware that Dunlop's headshape is very narrow compared to other brands.
As far as the 6.1 lineage:
The Hyper was pretty stiff, but a little softer than the classic.
The NCode version, which can still be found on auction, is softer, around 65 flex, and is a big favorite of some posters here.
The K version was very stiff (70) again and generated a lot of sore arm complaints.
The black/red/white BLX version was very nice, around 68 flex, but I thought it felt pretty arm-safe.
The new red BLX is softer, around 67 flex but the vibration frequencies (dynamic stiffness) measured by TW University for this frame suggests it plays more like 64-65.
So if you're looking for a flexier 6.1 I would check the NCode and red BLX versions. Also note that, at least with the two BLX versions, Wilson's quality control is really pretty bad, especially with swingweight, so you could try two frames of the same model and have quite different swing and impact feel between them.