Bro, what makes u feel that u need to change to another program? From a beginner to another - so take my words with a pinch of salt, "program" is just the way u organize your workouts. As long as u keep on progressing, u will grow. SL is a good template for a "program", just make some tweaks to suit your own needs.

And about stalling at your weight progression, check out this helpful link provided by Npad to overcome sticky points. Either that, or u need to check your diet.

I know how demotivating it could be, been at a plateau for OHP like forever, but that only makes it extra sweet when i eventually make the breakthrough! Persistence is a key in the game we're playing.

And look at it this way, doesnt matter what "program" u run, u are still gonna do the same lifts, u're still going to encounter the same problem sooner or later too.

For us (sorry if i shouldnt include u) who don't train like mad, a beginner program would only have run its course after years (min 2, I believe).

But if say u wanna experiment with other program to see if they work better for u, then go ahead, as long as u dont stray away from your goals. Just my opinions

Bro, if u are still running SL5x5, where u squat on every session, i think it's ok if u wanna reduce it to 3x5 per session. Alternatively, u could go 5x5 every other session like i do, as i find squatting every session too taxing.

IMO, if there is more important body part(s), it is/ they are on the lower body. Getting a proportional body should be the goal, not Johnny Bravo

For your strength imbalance, unless u could no longer row properly, it shouldnt hinder u. If u are really concerned, go for dumb bells row meanwhile, so that your stronger side wont take over.