I've been winging for 3+ years - waves not freestyle, strapless and 78kg.
I recently changed from my 75L Naish daily driver to 60L Rocket wing board. Releases super early but feels big with the square nose and when it's very light it sits a bit far under the water to pump it out so this isn't a keeper.
My old 75L Naish feels really nice on foil in waves but perhaps not the earliest releasing board. I can get going in lighter wind than the 60L Fone as it sits on the waterline.

* I have a 4'8 44L Rocket for when the wind is nice. Square nose doesn't bother me as it as its narrow and short, I also use it prone foiling.

Id like to know what experienced riders use + or - their body weight for a daily driver and importantly for light wind.

90kg, 72L Ginxu. All winds.

6-8 lts below body weight seems to work well in all conditions and not too short. Not too much in a blow but with enough volume to slog back to shore if the wind turns off.

At 65kgs I typically use my 86L 6'3 x 18.75" DW board for winds where the 18mph mark is not reached. Once there are gusts above 18mph I'll grab my 60L or go full sinker at 34L or 27L prone boards if enough depth at my spot and not too exposed.