I am in the same situation as you as I am looking around for a new board. I rode the 8'5 starby pro carbon model and then the 8'0 starlite construction in the recent run of decent swell on the goldy . I am 88 kgs and have been supping for nearly 10 yrs.
The pro is really light and fast on the wave. The starlite 8'0 surfs really good as well. The extra weight on the wave wasn't an issue IMO. it felt nice and settled on the wave and didn't feel as stiff as the carbon pro. Both models are the same shape.
The price of the carbon model is up there, and is hard to justify parting with 3k for a short Sup. The lightness of the board is enticing though.
I couldn't decide.... so walked away not knowing which way to go either.