This. Just because high volume works for some doesn't mean it has to for you; not to mention I get the impression a bunch of guys who say high volume worked for them may not have been working hard enough at low volume and the high volume simply made them work at the rate they need to (I'm not saying at all that people who succeed using high volume are lazy, I just think a lot of lifters at some point don't push hard enough and high volume is a way of reeducating them).
You seem to work yourself pretty hard so maybe you don't need all that volume?
I seem to be one of those guys who don't do so well with high volume after about six weeks, and out of that period I do better backing off the volume and just hitting the lifts heavy once a week or so. You may be the same.
The other thing with focusing on squat and bench is that you shouldn't forget your squat and DL can feed of each other very nicely. Again, this is just me, but I have yet to find myself only getting stronger at one of the two - and in the same vein, if one is shitty, the other tends that way as well. I guess is comes down to how your squat, though. I'm a wide stance, all back of my body squatter so the DL really drives it. I can see if you're a narrower squatter with more quad dominance that the transfer would be smaller, but it'd still be there.
Overall, just relax and trust that you'll get stronger as long as you work hard consistently if you let yourself recover. Smolov has a reputation as insanely taxing so might not be the best option.
Just in my own experience, this has what has worked to bring my squat up:
- go heavy once a week, working up to two heavy singles
- deadlift heavy regularly
- work on your speed for squats as well
- if you want to squat more frequently, use variations (paused front squats are a favourite for me, high box squats if you stall midway)
- if you compete wrapped, squat wrapped but not too often (once a fortnight at most works for me so far), and only above 90%
- use heavy clusters once a week for short periods of three to four weeks