potbunker Seven woods seem to be "The" club to buy.
I have found,, in my limited recent experience, that the head weights are too light.
It may have been that way for a long time.
In my spare set, I have a SMT 7 wood (21 degree) but at 5 wood length (42") with a FGS Electric shaft (68g). At regular 7 wood length, it was too light.
It was the same deal way back with my other 7 wood, which was an Ashton X-1.