Ok, from everything I read (Mostly wrong I suppose) it (several websites, Rit included) said to heat water, add dye mix, add 1/2 cup vinegar and add sheepskin for 30 minutes keeping the water warm. I did that in a 3 gallon pot. Both quivers were in the same amount of time. The only difference between the 2 is the one that shrunk the most, and didn't take dye well is the one that had the wool trimmed. While neither of them are super black, mine took dye better, and shrunk less. The other strange issue is that the deer antler button on the bottom of mine dyed jet black, and I have read that antler doesn't dye well. Anyway, if no one here has any info on what I did wrong, I can still remake them, as I have enough sheepskin for a few more yet. And on the plus side, the quivers themselves are quick to sew.
One website I found today says to not use the heat method to dye sheepskin, but the post that contained the info was buried so deep I never found the full context.
And I have no issue with a Purple quiver, it looks kinda cool. Now if it would quit raining and the humidity would return to the Utah norm of about 3% they may dry.