You’re on the right track!
SQ - 1x5, 2 back offs on sun/Thursday = good.
DL- you can go to 1x a week first thing on light squats day, but stick to 5 pound jumps for now. Another option to consider is DL on Sunday, chins on Tuesday, cleans on Thursday.
It isn’t low compared to your other lifts.
There’s no ideal ratio out there you need to hit. Just worry about the next five pounds.
Pressing - once you stall your options are microloading (best) and also more stepwise progress: 5 sets of 3 the first time with a new weight, then the next time go for 3x5.
Keep doing what you’re doing and recovering and you have another month of progress at least.
There’s a great piece in the training log section of this site “Can I get strong and also...” that I review often. Definitely handy.