The H6 revs pretty quick so IMO, running a 4.11 or 4.44 would force you to make a 2-3 shift on faster courses or be into the rev limiter for a little too long. The 3.90 should be fine. Also, it seems the 3.90 helps keep low rpm wheel spin to a minimum although I still got some and again, I wasn't really on it. The front 1.5 diff will be key too.
Oh...for those wondering, I have virtually no more AWD push! Instead, the car seemed to pivot...a nice feeling but, I'm sure my set-up will kill tires, I'll have to do MUCH more testing.
It's looking like sept 9th will be the next test day for us.