I think my problem is primarily weight and weight distribution. I weigh 100-105 kg. and positioning is critical, within 5-10 cm.
For us "bigger" boys I'm starting to think mast rake has something to do also with the heading ability of the F16's, it seems the lighter the jocky the further the mast can go back, the higher the heading.
Umm comments from any wise sage out there on this ?