RE: Trading a Carve 122 on a ISonic 135
I think you just had a bit of a "mis-match" between the 5.5 Aerotech Charge
(a nice little sail) and the Isonic 135.
I'm sure you would have had more fun with the 5.5 Charge on your Carve 122.
The conditions sound like they were really more in the 4.5-5.0 m2 range for other sailors on smaller boards.
You could probably use the 5.5 m2 Charge in those same conditions, but on a smaller board like I suspect the others sailors were on.
Yes, the 80 cm wide Isonic 135 is really too wide for those conditions with such a small sail.
In conditions where you would be using your 7.0/8.2 and 9.3, I think you will find the Isonic 133 really performs.
Your FE 160 should work well with the 9.3 and 11.0 race sails.
If you get to use your 5.5 and 7.0 alot, then keep the Carve 122 (or look at a smaller Isonic like the 115).
If you spend more time on the 8.2 and 9.3 then the Isonic 135 would perhaps be the better choice and get a smaller board (100-115 liters) to use for high winds and your smaller sails.
Hope this helps,