antonmik said..
I'm not a very experienced foiler yet.
It's a whole new skill you are learning. (Segler would go as far to say as a new sport.) Your friends, especially judging from the their sails you've shown us have had years of experience and are faster windsurfers than most. At this point it's not unreasonable that they are going faster than you. When you see the PWA foil guys keeping up with their friends, remember that they've been doing this almost daily for three years. That's a lot of practice.
What will begin to happen over the next months to year:You will learn to go faster - you'll learn to deal with the increased foot pressure at speed, your stance will improve and change to handle the power; and you'll gain the confidence to sail the same gear in a much wider wind range.
You'll also learn to go much further up and downwind than they are. Yes, in a gust they may/will be a touch faster than you but it's not going to matter as often you'll be off going in a completely different direction. They are very fast but only in a limited range of directions. Change the conversation to hard upwind or deep downwind and things are a lot more even.
You'll start nailling those foiling jibes or getting close. Yes, they may still be a touch faster than you in the straight but the jibes will absolutely kill them in light air.
You'll be gliding through those 6-7 knot lulls that find them falling off the plane and standing there waiting for the next puff. Your ability to glide through lulls is significantly better than your finned friends. And, when you can chain light air jibes together, you will be in another dimension.
I posted a video from the Defi Japan day 4 live feed in the Defi Japan thread. Take a look at it at those time stamps.
www.seabreeze.com.au/forums/Windsurfing/Foiling/Fin-vs-foil-Defi-Japan-Day-5?page=2 The foils and fins in those conditions had two entirely different races. You aren't there yet but this is where you are headed. And, if you just want to go out and drag race your buddies on a slalom board on any particular day - that's great. No one here is against it. Foiling is supposed to be fun. As long as you keep it fun, all these things will happen with time. Good luck, let us know how it's going and if you need help on something specific.