I am not at 4 plates, and likely never will be just bc I stick to db press more often and I dont go super heavy since Im in my mid 30s. From what Ive seen and experienced with gear and with others, your lifts do go up while on and tren is a great strength enhancer, but 90 pounds is a lot to go up in any fast manner, especially when you start hitting those higher numbers.
Going from 3 to 4 plates isnt impossible though, however if thats your main focus then Im certain you can do it if youre close to 3.
I havent used LGD or MK677 so idk what those do, but Ive got a few very strong friends and when they want a crazy boost in weights they usually to Test, Drol, and Tren and not even a crazy dose of Tren. That is a harsh duo in Drol and Tren, but it works well.
I used to care a lot about my strength, but that the last thing I strive for is my 1 rep max now. But I do understand how that is important to many of us, even if we arent competing in strength.
Idk what your cycle history is though, but I sense it isnt extensive? Or is it? Even lighter anabolics can give great gains in strength though if youre doing it right.