Hello Cheryl! I'm not familiar with what you've done up to now, but I looked over your spreadsheet and the only thing I can see is that you've switched doses 6 times over the last 8 cycles. Lantus is a depot insulin, and it's important to hold the same dose for 6-10 cycles unless Joplin "earns" a reduction, and usually increases and decreases are only .25 unit. (Although I can see you've been in reds/pinks a lot so you might have been told to do increases in .5u increments by another member with more experience)
The PS numbers aren't the most important numbers...it's the nadir (where the Lantus is it's MOST effective in each cycle) and it looks like you were into some nice greens during this last cycle!!
I'd like to see some more experienced eyes take a look, but until then, you're on a pretty high dose now, and I'd suggest since he did go fairly low earlier today, you might want to make sure to get a +2 or +3 and see where he might be headed overnight. Most cats do drop lower at night, and I'm concerned about Joplin getting too low. If his +2 or +3 is about the same as his PS numbers, the cycle should be a quiet one, but if you see a big drop or big increase, it's a more active one (and of course a big drop would mean you'd want to get more tests overnight to make sure he didn't go under 50)
I'd stick to the 3 units you shot tonight (unless he goes too low or someone with more experience advises you differently) and hold that same dose for at least 3 days (6 cycles). We want to keep him safe, as well as giving his pancreas the best chance at healing!
Also, if you add the ? icon to your subject line in your first post (it won't show up otherwise) and add something like "Dose Advice Please", it might help to get some of the other members to weigh in with their ideas.
Good luck to you both!