Go with it and forget everything these over analytical fellers ever said.
Seriously....you will be fine. These guys are talking about pulling every last fragment of horsepower out of a race car. Your main focus is to get your u joints in harmony on a street car. That will allow the longevity you need and reliability. There just isn't much pinion wrap on a 4 link. I still like .5 degrees less pinion angle than drivline personally. I originally thought much like widow maker on the donward pinion angle and actually tried it. I can't say I noticed a driveline vibration but when I set it up in on the same plane I immediately noticed less driveline resistance and I think my chassis dyno proves it.