Thank you both for your advice. It's good information to know that my 145 liter Carve is more similar to the 133 Futura. ie making a move from that board to the 122 wouldn't be a huge difference.
Sounds like the best board for me would be the 101 Futura. Maximus suggestion of using the 7.0 on both boards makes a lot of sense in extending the wind range of that particular set up. Also being able to use a 5.0 on the Futura makes sense.
I'll plan on keeping the Carve, working on my technique and trying to force myself to use my F2 while keeping an eye out for good deals on a FU 101.