Try Moses carbon foils. I use and sell them and they feel light to me in comparison with other foils. Everyone else who has a demo of my Moses foils is also impressed by the light weight. See
moseshydrofoil.com/They're also great performing foils to use as well, with good interchangeability and a big range of types from kite to surf to windsurf. You can have a mast fuselage setup that you can stick a whole range of wings and stabilisers on to get the performance that suits you.
I think Slingshot has some association with Moses as well selling the Moses foils rebranded as Slingshot models.
There is one problem however. Once you've tried a light foil setup you won't like anything that's heavier ...