Eguller It's not a shaft, nor flex, I normally use, MCA Kai' li 50R. But it works so well I got one in my 3wd also, albeit the 60R. Not sure that was the right choice(yet).
That said, I did use the HOF Quicksilver A flex 1 round and had similar results. So imo, it is most likely the head itself. It is only a 450cc head, but looks even smaller at address.....no 'pancake' look to it. More old school look, but not the pear-shaped heads of yesterday.
Trust me when I say I have had some bad, if not horrible, hits on this thing. And still the ball(sometimes) ended up in unfamiliar spots in the fw!
I sent Jake a pic the other day while I was playing. Told him I was getting tired driving so far to hit my 2nd shots!