I use track with the converter, cant be bothered to start changing where the mast is though - maybee in the future. Using track for winging, then it goes all the way in front of the track. I experienced the skimming one of the first times on my new setup 799/399 in 20-30 knots conditions, I would go up at once and stay all the way up - not able to do nothing about it(my sail mast is then all the way in front), then i skimmed the wrong way

and it still was awful , then when changing it the other way the - back wing pointing more upwards in the front - it became perfect. When i say perfect it meens that i dont feel any presure front or back foot, I was able to do turns and jibe again - it was a big difference - more than I would have imagined.