Back from a day/night out, so a more detailed response now.
And I use alpha track so 50 on a human meter doesn’t really help me much.
We use 68 as the "don't shoot below" number if using the AT. No way I expect you to shoot near that and head out the door, especially since you don't have the data yet to do so. I am hoping he will give you the opportunity to see what happens when you shoot lower numbers, on a cycle when you can monitor. I am curious as to what happened tonight. Unfortunately the SS is not filled in, so I'll have to wait to find out.

If you want to use 120 as a "don't shoot full dose" number for now until you gather more data, that's fine. Also remember that shooting a reduced dose is an option. I would start with a half dose and see what happens. The depot will help you a bit in keeping the numbers from going really high. Over time, and as you gather more data, you may feel more comfortable shooting full dose on lower numbers.
For me, I knew I could shoot in the 50's (human meter), because she got a 30-40 point bump from dinner, onset wasn't for another 5 hours and she would continue to go up until then. And yes, I did occasionally see the nadir of the previous shot go into the next cycle, or around +15. So I could delay a little at PS if I saw numbers in the 50's, to make sure she wasn't still dropping. The lesson, learn thy cat. Know the onset, nadir and duration, learn his reaction to food and various carbs. With him in nicer numbers now, get some +1 and +2 tests, to see what is happening in the early part of the cycle. Try to get at least a before bed test every night. Data is your friend and what keeps your cat safe.
As for dose, if you are nervous, you could always "skinny" the dose back to 7.25 units, and see what happens. Consider it an experiment. He didn't look very good at 7 units, but maybe half way would be good enough. I used "skinny/fat" doses to move the nadirs closer to where I wanted them to be. I expect you'd be happier with higher greens than the 70's. Somewhere you'll also find the sweet spot where you have nadirs you are comfortable with, and the high points are mostly under renal threshold. It will take experimenting to find what works best for Yoshi.
FWIW, I have looked at the spreadsheets of quite a few acro and non acros on Levemir and how they respond to the insulin isn't remarkably different.