adjustable wake plate?

Okay, so I just a bought a 1985 Supra Sunsport Skier. The boat is awesome! Engine is strong, new interior, sweet tower... The only thing not great about the boat was the wake. I bought it anyway because I figure it could be an easy fix. any suggestions besides the obvious fat sacks? I thought Supra was known for their adjustable wakeplate, but this didn't look adjustable??? Actually it looked adjustable from the rear, but when I looked at plate itself it was a solid piece. If it was going to adjust up or down it would have to bend the plate ( I guess I was expecting it to be hinged or something...has anybody seen this before?