Working on the install of a I-20 self tacker to a TheMightyHobie18 curved beam. The tacker has 6 welded feet. I will need to take 3/4" off the 2 center and about 3/8" off the next 2 and the outer should sit right on top just above the tramp slot. I'm concerned about the sheeting angle. Can't find good pics to compare. Due to the rise of my crossbar the unit sits a little higher than it would on a flat beam. It seems that my sheet angle will be more straight back than down ie pulling the foot more than the leech. I'm not great with sail shape, how will this effect the trim off the jib? Should I mount the unit below the crossbar where it would typically sit on a flat crossbar and pulling more on the leech? Or is the angle of the unit to the jib clew irrelevant? Any and all advice welcome except the old " why don't you just buy an F18".