Have you dried your filament? I tried literally everything to fix stringing and nothing worked. I dried my filament and had a perfect print. It doesn't matter if the filament is 2 weeks, or 2 seconds old, they can come from the factory with too much moisture retention.

I think it is best to first print a temp tower then some retraction test where you would stick with same temperature and variates distance and speed. You can use tools here to make it simple. https://teachingtechyt.github.io/calibration.html

If after that, you still have stringing, best is to test a new spool (or dry your spool) as too much humidity in pla will give you stringing whatever settings you use

You may want to take a look at pressure advance if you haven’t already. Seems to help a lot with retraction on bowden printers.

https://ellis3dp.com/Print-Tuning-Guide/articles/pressure_linear_advance/introduction.html

Do you have z hop on? If yes, try lowering it a bit. Going from 0.4 to 0.2 helped me a lot.

Haven't done any printing in PLA (Only PETG and TPU) but is there a chance it's due to your filament being too wet?

Dial in your temperature first with a temperature tower. Make sure you set the temperature changes at the correct heights in your slicer. Once you have selected the best temperature, then print a retraction tower. Make sure you set the retraction changes at the correct heights in your slicer. I have an ender 3 pro, and ended up at 200° with 2mm retraction. Remember to dial in one setting at a time. Best of luck!

Have you used this same filament from this manufacturer before and had different results?

Polymer blends vary wildly between manufacturers and there are all kinds of additives used to adjust the thermal & mechanical properties of the material. Even the dye used can affect the way the plastic behaves. Most PLA filaments on the market are not actually 100% PLA because the resulting products tend to be brittle and fragile, so various adjusted PLA blends have become more popular. There are a lot of options for plasticizers that can be added, and there is absolutely no standardization between manufacturers of which ones get used or in what ratios they are added to the base PLA.

I haven’t shown them, but I did print a temp tower and retraction tower when I first got the printer, which is how I got my initial 190deg, 4.5mm@40mm/s settings

This is not really good enough. Every material is different, even the same PLA blend from the same manufacturer but in a different color might need different settings to get good results.