Help with workout plan

How were you doing PPL at 4x per week? The PPL program is best suited for 6x, though you could also do PPL and a full body for 4x.

I agree that ULUL is better for 4x. I do that with an asynchronous split, so every other day. I add arms and a little shoulders into the L days, and don't do direct arms work on the U days, I leave those focused on chest and back. You can count the indirect arms work while doing chest and back at 0.5 volume.

Your upper volume is significantly higher than your legs. I'd recommend shifting that balance. You just don't need that many exercises for chest or back, and certainly not on the same day. One press (slight incline or flat) and a fly is really all you need for a chest day, and one horizontal row and one vertical row is a good back day, 3-5 sets of each. Is more better? Sure, with diminishing returns. More exercises also means more time waiting for a free machine and getting into the groove.

At 8 months in, you're probably near the end of beginner level. You should be targeting about 15 working sets per week per muscle group. Again, more is better, but with diminishing returns, including your ability to adequately recover from much higher volume.

It sounds like you're mostly sticking with machines? That's totally fine, but you should consider bringing in more free weights, for exercises like barbell squat or Bulgarian, RDL, dumbbell press, etc.

You should be able to chest press about 50% more than you can shoulder press. Perhaps your chest numbers there are indicative of too much volume in a single session.

The seated calf raise has been shown to be very inferior compared to the standing calf raise.
https://www.menshealth.com/uk/building-muscle/train-smarter/a46645280/best-calf-muscle-exercise/

Hopefully you're ticking the other boxes too, like a small calorie surplus preferred, at least 0.7g/lb protein, progressive overload, and getting enough sleep? Creatine is a great addition too.

It is a quite comprehensive and well-prepared plan, but along with this workout plan, you also need a good and balanced diet.

@nicsflyingcircus That all sounds good.

I assume front pulldown == lat prayer?

The back extensions you could probably do any time you're warmed up, even as a superset with something else during rest times.

With arms, supersets are a nice time saver too. Start with the side you want to focus on.

For the calf machine, understood if you don't want to change floors. One possible option is use the first stair for standing calf raises. Do them one leg at a time or both legs, and optionally with a db in your free hand. Although, you say you're doing them on the leg press, which is basically a standing calf raise already, so maybe you're good already. The seated calf raise would you seated with knees bent at 90 degrees. The standing raise would have knees close to lockout, like on the leg press.

Was gonna say I never mentioned calf machine, but Retro already talked with you about it, so 'nuff said.

I personally do my calf raises when I do leg presses as a superset.

Front pulldown (it's a narrow, overhand grip) -or- high row (narrow underhand grip)

I assume front pulldown == lat prayer?

And yeah, front pulldown is a Lat exercise.

Agreed it's a lat exercise, but I think we're all just not using the same terminology to mentally picture the same exercise. To whit, the way they are normally used in the lifting world:

Front pulldown / lat prayer: stand before a cable bar attachment, starting with arms raised overhead and elbows straight. Without bending the elbows, pull the cable attachment down in a sweeping motion to your waist, similar to if you are doing the wave at a sporting event (or in a prayerful motion, hence "lat prayer")

High row: Usually a machine (can be a cable attachment) where you sit with arms stretched before you but above the waist (up to a 45 degree angle) and pull in a semi-horizontal, semi-vertical motion through bending the elbows

Pulldown / reverse (underhand) pulldown: similar to doing a pullup/chinup, but with the body seated before the cable and the attachment moving, not the body

All three types of motion work the lats, but with very different styles of motion.