In aus we have three breeds of 5.8 0-1200 1200-1550 1550-1650 sail numbers.

the oldest series all weigh in around 200 kilos with the NA rig. 1200-1550 are more like 180kilos and the 1550+ around 160 kilos.

the reality is lighter stiffer boats go faster. just ask any laser sailor.

the 1550+ boats are laid up with a lot less fiberglass. when you look inside them you can see daylight.

I wouldn't bother with a kite for it, the bridal foil makes the pole too low. if you want to play with a kite then buy a f-18. plenty of good used tigers and original nacra's going for a lot less than you can add a kite to your own boat.