I'm 67kgs and have been using a 75L 5" skywing , it's been great in light winds and helpful to get going after jumps. I've started to do rotations and feel I would like a smaller board , but still want enough volume to get going easy after landing.
Really like the look of the skystyle boards but not sure between the 55L & 65L sizes , I will probably get a smaller board around 30L for windy session at a later date and possibly even keep the 75L if I feel it helps on super light days.
Any info or advice would be appreciated

If you sail in a windy spot where you usually have more than 13-14 knots.. i'd say go for the 55L ... I am 77kg and I tried the 65L with 10-13 knots and 5.5m wing ... and was OK. If you want to be a little safer on the 8-12 knots range, then the 65L.

Yep the 65 would for sure be your big board so if you want to get a 30 go 65. If you just want one board the 55 .
im 92 kg and can go in 10 knots with 5.5 dlab on the 65 ??

Thanks for your replies, I'll probably get the 55L and keep the 75l for super light days.