I'm pretty light too snides at 70kg but still have never out pointed a keelboat, maybe to pinch over one but not long term for good vmg, maybe it's just me

Racing foils is certainly quite different tactically, particularly upwind as you pay a large penalty for a tack, once you can foil gybe downwind there isn't a huge penalty. You have to be very forward thinking, you want to plan when and why you want to be somewhere and because they are so fast you have to plan early. Being able to mode correctly is a big thing too, much like the moths, you have to know exactly when to be high and slow or low and fast because the gains can be absolutely massive. Banging the corners is a thing for sure but many times in our NSW series last season I made huge gains by doing extra tacks and playing a shift, or rather playing the pressure. That's the big thing on a foil, you want the pressure, pressure = speed. You can be high and slow at upwind 16kts, get even a small knock but another 5 kts of pressure and you can be doing 20kts at the same angle....that is enormous.
Downwind can be even trickier, if you pick up a good gust at the top under a certain wind strength you can ride that all the way downwind, gybing to stay in it obviously and make absolutely massive gains. People who say there are no tactics in foil racing I don't think really appreciate all the nuances of it. Sure, you're not taking that 5 degree 15 second shift like on a wally, do they even do that...can't be easy to tack a plank, but there is more to it than 'banging the corners'.