One thing I've noticed with the EF head, is it is low spin. Just bores through 15 mph wind, headon, really not 1 yard of distance loss. I've used 2-3 different shafts, same results. It also has a lower than normal trajectory for me, and I normally hit some high ones with 7.5 * heads. I haven't even tried this thing at 8 * yet. Just saying you probably do not need to get that lefty adapter, to go 7.
I've always been of the thought that any LD branded heads would have most, or all, weighting forward; extremely low spin. I had one a few years back and could only hit knucklers with it with my high tee/hitting up. Pisser. 😄
If you decide on the EF, let me know. Although I do love the head (9*), I've also got the Cobra that is in a better setup for me, and is equal-better, in every aspect. I've got 4 adapters for the EF also.