I found that the 4.08 gears are too much gear for the manual transmission drivers. The shifts between 1'st and 2'nd are so quick, I bounced off the rev limiter far too many times in first and second gears.
The SRM seemed to be out a few hundred RPM but either it has adapted or I'm use to it now as I barely notice it.
I've changed my rear diff to the 3.9 gearset from the 4.08 and hopefully this will make the 1'st and 2'nd shifting easier, SRM and less rev limiter bounces.
Time will tell.