What is the limiting factor driving the need for 1.5" spacers? What is the natural offset of your wheels?
Honestly, while zero scrub gets thrown around a lot, I actually think there is something to be said for a small amount of positive scrub. In large part because if you want zero scrub radius, but add any camber, your mathematically perfect zero scrub now becomes negative scrub. Negative scrub is great for FWD, but I'd rather err positive than negative on a RWD car. Which is good, because I doubt you'd have much luck finding the 63.5mm offset wheels that would be required for you to hit MV8's zero scrub geometry, and spacers that increase your wheel offset are even harder to find.
If you notice, MV's geometry follows the basic guidelines of double wishbone suspension design, that your original attempt missed. Lower control arm roughly horizontal. Upper control arm a bit shorter and angled down slightly towards the chassis. However, while VSusp is fine for rear suspension design, the fact that it only operates in 2D and does not have any ability to account for the 3D geometry of steered wheels, it is far less suitable to front suspension design than Wishbone VB...As found here:
http://locostusa.com/forums/viewtopic.php?f=26&t=11985If you play around with that, I think you'll see that once caster's effect on dynamic camber is factored in, you may not need as much camber gain and will be able to go to a little longer of instant centers than a 2D analysis would otherwise indicate. I'll have to pull out ol' Bessie, our old laptop where my old Wishbone files are, to see what type of numbers I was last looking at this stuff regularly.