My weight is 75kg/165lbs and kites are XR4 12m, XR5 9m and 7m. I feel that wind range of my 12m and 9m overlap too much. Maybe replacing XR4 12m with Nexus 13.5m would be a good idea?
Or Nexus 12m would be good for small waves with wind around 10-12kts?
Difficult matter. It is very personally/individually. Normally, in sunny day should not be any problem with 4/3 wetsuit at 14C for anyone. Know guys who ride in 5/4 at 5C without problem.
I would stay with 4/3. To be on a safe side take old jacket.
ChickenD!ken - many thanks for sharing your experience with wind range and sizes. I was afraid that 6m would be too small. Because I have already got XR4 12m then 6-9-12 have to be perfect