Update 8/2/22: ok I've made a webpage describing this: https://swng.github.io/covervisualiz...

Replay: https://tetr.io/#R:0Fs4wNSUA

ok so bags 4 and 5 are pretty queue dependent but assuming you can get those bags right you can go right into a form of mech v2 without any waste T and with some I tucks in the middle of the well it's sufficiently compact to get 20 TSD

thanks to reminder for figuring this out

Here's a fumen detailing the whole path: https://tinyurl.com/reliablemechanic...

You basically need early L on bags 4 and 5. There's an alt path for bag 4 where you swap the location of the S and OJ units that increases you success rate slightly.

bag 1: 64.4444444%
bag 2: 85.357%
bag 3: 100%
bag 4+5: 48.01587% (68.69% + 63.33% for main path, or 50% + 50% for the alt path)
bags 620: 100%