Carve 121 with 8.0/6.5 sails

I am looking to move down in volume from my current 150 ltr/ 75cm wide board. I weigh 65 kilos and have got the basics of windsurfing covered (Waterstarts/Carve gybes...some planning). I sail on a lake with winds generally in the 12-16 kt range, light chop and with the 8.0 sail 90% of the time. Would the Carve 121 be the correct size for the 8.0/6.5 combo under these conditions and for my weight. Would there be a big difference in the early planning of 121 vs 150 ltr board in these conditions?