Interesting... Couple of questions. Is it heat causing these issues?? Putting it into an enclosure seems to have helped with some thing but not others... I did notice stepper issues until I was printing with the top and side flaps of the (stock Creality) enclosure open to allow heat to escape. I've got a Micro Swiss direct drive and hot end waiting to go in and would consider doing the mainboard as well if that's going to make things easier. What would you upgrade to? The 4.2.7 or something else? I assume that's using a 80/120mm fan with a step down converter to 12V? Got a link to the page for those stl's? I've got a pile of 120mm computer fans sitting on my desk at the moment which I'd be happy to repurpose, 80mm I would have to buy but it's not like they are expensive.