I had a bit of a "learning curve" when I started too. We don't have the + kit, but here is some advice.
Filament matters, but you have tried a bunch already. I would recommend going back to Ultimaker brand filament until you get things figured out.
I also moved the filament spool and added bearings. I put the spool below the printer so that the filament goes into the feeder at a more gentle angle. As straight as possible. I made a spool holder with ball bearings in it so that the spool free spins.
Oh yeah! Check the d@mn PTFE coupler thing. The white thing in the print head. It is a consumable and wears out at higher temps. It can cause extra resistance just before the hot end. It is a pain to inspect and replace. Buy the I2K insulator from GR5.org. It's worth it.
Bed leveling is also important. (Maybe everything is important...) Anyway, don't yank prints off the bed. Don't use a scraper. Don't wrestle with it. The print should just "pop" off the bed at the slightest touch. When the print is done, position a desk fan directly in front of the printer (pointing at the printer), set it on high, and WAIT. The glass and the plastic will cool at different rates and eventually the print will easily come off the bed. Be patient. It will take longer than you want it to. If need be gently remove the glass and then wrestle with it, but waiting is better. This is important because it means you won't have to re-level the bed every other print. I haven't leveled my bed in about 6 months. We print something every couple days. I set the nozzle to bed distance to one or two post-it notes. Sorry, I don't remember which.
For PLA set the bed temp to 60c. Print straight on the glass. The geometry of the part matters too. Put helper discs at the corners. I don't use rafts.
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