i think one size (width) down switch would be perfect for you, which is the iSonic 107. From 75cm to 68,5cm width makes significant easier use in stronger wind.
dont worry about the feeling 'cos the too big volume different, because the 122 was only 114 liters and the current 107 is 105 liters.
with this 167W/107 board combo the overlap is minimized. but you are still able to play with a 8,6 in medium wind too - if you wish on slaom board.
(BUT... if you want to switch from formula to slalom in fw10sqm stabile over power condition you can thinking on 97 too.)
the 107 little bit longer too than the old 122, so get early planning is not really big different.
hope its help,