I have never messed with z hop at all.
I have had to remove the 0.1 z offset when using my glass plate as it was 'airstruding', but it works 100% better with the 0.1 offset when using the mag plate.
@Tiwaz you are having some really bizarre issues that seem really tricky to nail down. You might want to try a complete uninstall and reinstall of FLUX Studio to get rid of any 'cruft' in settings, and also give your whole machine a good looking over. Specific areas to check close are the extruder, work the lever release a little too, make sure it isn't binding, and look in there with a flash light to check for old bits or any nicks or burrs. Look at the pulley and hobbed gear alignment while you are there too. Check the PTFE connections at both ends, and of course, give it a good lubrication, but before you do that, take a close look at the ball heads with a loupe or magnifier and check for any signs of chipping or chrome surface wearing out.
I get that dragging on infill, but only once in a while. But you are getting hit with what seems like a bunch of issues, so let's try to eliminate any hardware culprits. Then it will be easier to focus on software.
Trouble is, jumping from S3D to Cura to FS really only compounds the issue. If you can get it making a 'decent' print with FS, then the other slicers can really shine, but trying to use the other slicers to overcome something else is treating the symptom not the cause. I'd work on getting a basic marvin out of FS with Cura, then Cura2 first, after you verify hardware.