Echo the others about volume. There's nothing inherently wrong with doing bench and OHP every session though, just have to be sensible with the programming.
My suggestion, feel free to ignore as I'm. No expert and what works for me might not work for you. I assume you're doing your workout 3x a week as you say it's modified SS.
Keep squat volume roughly as it is.
Drop deadlift to 1x5 every other session. Don't superset it with other back exercises.
Squat before deadlifts. If you want to not do squats on deadlift days so you're fresh for DLs that'd fine, could also reduce squat weight by 10% on deadlift days so you have more energy. How necessary this is will depend also on your conditioning, recovery and simply what weight you're shifting.
Alternate which you do first out of bench and OHP. Only try to progress the one you do first, and knock anything from 2.5 to 10kg off the weight you do second. How much you take off will depend on your conditioning and recovery.
If you increase a weight and can't do 5x5 don't just deload and try again. You need to increase training stimulus to progress. If you can't do 5x5 try doing the same total reps over more sets, e.g. 9x3, then 7x4, then 5x5. Sure, it takes 3 sessions to get to 5x5 before increasing the weight but slower progress is better than no progress. Things like your shoulders are small and OHP can't increase indefinitely.
If you want to look at my blog I've explained my programming in a bit more detail. However, I'm returning from a few years out so am able to progress more quickly than true noob. I'm also doing high volume but know I can handle it - everyone is different so what works for one might not work for another.