u/Empty-Historian-6574

I’m having a lot of difficulty with bifocal lines being even and straight across, particularly on semi rimless. I just ran a test where I drew lines on the demo lens to ensure it was straight when tracing and blocking. On my end before edging they look fine, everything seems to line up good and then it comes out with about 5ish degrees of slant out of the edger. Am I missing a step or is there any sort of trick that helps ensure they are straight across?

I’m on a 7ex edger, 3bx blocker and 4Tx tracer (all national optronics equipment)