I need to set the pinion angle on my new axle so i can weld the perches on. From some highly technical mathematical calculations including Pythagorean's Theorem and tanget angle calculations i figgered out that the difference from where the pinion is level and the tcase is about 16*. i have like 3* spacers under the springs, how much more angle do i need to add via perches? I've heard i should only have 2-4* deflection but adding 10* seems like a lot to me? is that correct?