talked to the driveline shop last night about the shaft ... guy straight up said "i've seen every failure and break possible, and i've never seen this"
SO, i decided to get a whole new shaft and have him bandaid the old one to have a spare. he says he'll fix the old one for free since i'm buying new, these have always been great guys, win. and since the 1350 needs clearanced to work right, he's actually going to clearance it for me before high speed balancing! it's going to be sooooo much better. he said he might not get 100% of everything i need clearanced, but he said he would get the majority of the worthless metal out of there before balancing.