Truthfully, I'm surprised too. I have a 5700 I could try which would be easier to do. Like you pointed out, the Jato is heavier but runs just as fast with the same exact setup. However, the CRT hooks up much better which would present a heavier load on the system. Still, it's a head scratcher all right. I may look at a 1920, but it's kind of expensive if it's not going to work any better.
Brian, I'm really liking both the 10L and Basic XL 3100. My motor mount, pinion, and other stuff should be here by Friday-Saturday and I should have it going by this weekend. So, I'll let you know how everything runs.(temps and such)