55.2-59 Spring Rate for an Angle Install

[SARBlade]

Hey all, got my Welderseries 4 link all burned in, now working towards the rear coilovers. I've done some research on the site et al. I have decided to go with QA1 for a ride height of 14.5". Its the spring rate I'm worried about at the moment. From what I've read, most put in a spring of 250 lbs. I can't determine if this is a vertical install or one that has gone in at an angle. Mine intend to be at an angle of about 28º. This gives me an angle correction of about 27 lbs, so I would need a 280 lb rate at 28º to get 250 lbs. Or, has most people installed a 250 lb shock giving them essentially a 215 lb spring rate? I've been using a .87 angle conversion for a coilover spring mounted at 30º. Appreciate any insight, thanks.