LeeD said..
At 155 lbs., I went from 1220 wing to 600. Maybe 2 mph diff.
My bud bought Glide S beginning of year, still on it. He is much better than me.
Another bud at 145 lbs. also uses Glide S, can foil jibe after 20 days, but he's a Master freestyle runner up 5 years ago.
We don't change wings.
What sort of winds are you sailing in LeeD? I had my first go on a Glide Small yesterday (84kg) with a 4.2m wavesail. Needed all of 18-20+ knots gusts to get going at my guess, more board speed to get flight, less forgiving in the lulls, but great fun as a high wind foil.
Very responsive, carved through swell nicely and more control downwind on swell. I had only sailed the Large until yesterday. Large is great for learning and lighter winds, manageable in higher winds Bertie, guaranteed flight from 8-20 knots.

Mort