Without a doubt, only reaching slam level a couple times a day will really make things drag on especially if you’re still losing quite a bit of fc between doses. (You’re only logging your additions not your test results in poolmath so it’s hard to tell exactly what’s happening)
The general idea is that you want to kill algae faster than it proliferates not the other way around. Hitting it hard, every couple hours over the weekend is often enough to get the upper hand & then be able to move to dosing 3-4 x’s a day during the work week.
Also, Did you remove & clean the steps/ladder? Squirt bleach down in any unreachable areas of them. This is war! Take no prisoners

With that much algae/lack of clarity it’s hard to believe your filter pressure hasn’t increased in weeks.
Are you certain your gauge works properly? When the pump is off it should go to zero.
A new gauge is about $12 at lowes.
Life can definitely get in the way of pool stuff sometimes, that’s ok

- make big strides when you’re able to make it a priority. If you hadn’t been maintaining like you have been you probably would be looking at a black swamp right now so kudos for keeping that at bay, now it’s time for the real push if you want to get it over with.