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The filament monster is probably because the nozzle has a less than perfect seal to the hot end, causing the molten filament to leak.

I don't know if your hotend is an all metal one with a heat...

Did You adjust the 'Z' offset in the slicer or just the 'Z' height when setting the initial nozzle difference?

I should have made that clearer in my answer :o, now rectified.

From your...

The line is called a 'Z' seam, it happens where one layer ends and the next one starts.
There are settings in the slicer as to where you want it positioned.

Two suggestions......

Try Prusaslicer or Orca slicer.
Or email.. may@qd3dprinter.com

I think all this AI generated stuff is rapidly leading to a place where it will be impossible to distinguish between fact and fiction.
In your instance it is probably a good tool.

However, there...

Try just using your standard slicer profile for the filament.

Check the way the filament feeds off the reel for any sign that the filament is trapped under another winding causing the filament to stop feeding from the reel.

That means your 'e' steps are right.

In your slicer there should be a flow ratio setting or extrusion multiplier. In Orca slicer there is a flow ratio calibration file to print and instructions on...

Possibly under extrusion with the 0.6 nozzle

Did you print a few squares to check the bed level?

Can you go into your slicer settings and increase the 'Z' offset by either plus or minus 0.02 mm and redo the print and see what changes?

I'm...

It's the 'Z' offset that needs adjusting not the 'Z' height.

Have a look on Youtube for videos on adjusting it.

You can adjust the "z" offset in Prusaslicer.

Suggestion........

Print perhaps 6-9 random 50mm x 50mm squares just 0.2mm thick on your bed.

This should show you how level your bed is and also if you need to adjust the 'Z' offset.

I...

The whole STL looks odd to me.

Normally the STL would be just the actual wing I think, I can't see the point in printing the whole rectangle in several layers and then printing the wing profile on...

When I load your STL into Orca slicer it shows the first fifteen layers are just a solid rectangle, the remaining sixteen layers are just the walls of the wing layered on top of it.

When I import...

Can you post the file you are slicing?

There are several cad programs that you can use, some of which are free to use.

Like anything new, there is a learning curve so have a look on Google for what is available, you will find a...

Suggestion........

Print some random one layer thick 50mm squares at 0.2mm layer height. Examine the result.

Then increase or decrease the 'Z' offset in 0.01mm incriments at a time and check...

Just be aware that a hardened steel nozzle might cause problems for normal plastic filament, if it does, just fit a normal brass nozzle.
I believe it's to do with the friction of the hardened...

You can cut a piece of new teflon tube, make sure the cut is at 90 degrees at the end and a snug fit against the nozzle.

Ideally you need to convert to a bi-metal hotend with a heat break above...

Does the extruder have a teflon tube between the exruder and the nozzle?

If it does is there any sign of degradation? Also check that the end is cut square and fits snugly up to the nozzle.

just suggestions.....

Check extruder teeth are clean and not filled with filament.
Do a cold pull to clear the nozzle of any old filament.
Replace nozze.

Just my take on the problem......

Does the new hotend have a thermal break in it or does the teflon tube actually contact the nozzle?
If the latter is the case, printing at 250 will more than...

Loaded your STL into Orca slicer and it appears you have two STL's one on top of the other.

Most FDM filament is not recycleable it seems, so chuck it in the trash bin.

I've been using the same rough side PEI sheet for two years now and have just done the following.....

Check bed level.
Clean bed with IPA on a paper towel.

Print five or more 50mm square files...