The 1% turned out to be the fact I forgot to tighten the lower alternator bolt:
Took it on a drone trip to a local park. Skip to 5:00
I put about 2 gas tanks through it around town with 0 issues, put it away sometime in November.
Then, here in Ohio we had a weird singular warm Wednesday in February so I took her out for a good evening drive:
Came home to a puddle of coolant right under the weep hole of the trans... Considering I run 70/30 and we had a couple really cold days I jumped to freeze plug at the back of the head. AKA engine out again.
I did diagnosis the right way though. Turns out the lower bolt on the reroute got loose and the reroute was leaking onto the trans. Fixed in an afternoon. Then took her back out for some photos
iPhone photos hit different.