So, I've been riding it as-is but pulling my hands shorter on the extensions. Has felt fine. Today I lopped off some of the extensions. It's now within a gnat's ass of the 10cm/4inch rule. The gnat's ass part is the stupid shifter. But whatever, I ain't no pro or high level rider. I used my picture hanging laser level and a drywall square to get it right.
I did want to get it "visually" closer to sanity. Which it is now. A passing glance would be "hands up" but nothing like "holy crap that's not even close".
I'll probably fab up a little "finger catch" like those folks have been adding to the extensions for track. I have an idea how to do it without adding height/length.