Thanks angr77,
Lots of useful info for me!
I have actually opened up my Megadrum recently to see indeed all the inputs are connected to the positional sensing board lol, so hardware looks healthy.
I did the gain adjustments; my thresholds didn't raise as much as I thought, I do however have a lot of false notes now on my crashes I didn't have before, 1 hit = 1 correct + 8 false small velocity notes (obviously while the cymbal is swinging). The Dyntime 60 and DynLevel 16 and Retrigger at 127 didn't help, but if I raise velocity it starts missing hits, really difficult to find a comfortable in-between, but other CY-14C requires completely different settings!

Something isn't right with it.
Anyways, going to start fresh with Angr77 new config tomorrow and try again.
You know, I swear I double check everything when I save configs, but like you spotted, some auto highlevels were still on, and PS was on in a wrong input... *damn*
I know that sometimes I'll switch from Snare to the Crash1 and although the label changes MDM still displays the settings for Snare, that's my excuse, the dropdown menus stay on the screen when I click off them; that's how I can tell its time to restart lol.
I wasn't sure what I was doing with the hihat notes.
BFD3 seems to behave fine with just the tip and shank keys bound to D 0 and D# 0
The only problem is I can't seem to make splash work through Megadrum. BFD3 is interpreting it's own splash and chick atm, so I didn't even bind the notes, but I would love to know how to make it work through Megadrum at some point.
Btw I have one more question;
I was following your guide Angr77, with my thresholds set at 80, doing single hits and reducing the Dyntime and DynLevel...
I went down to 0, on all settings, and I still wasn't getting any false triggering. What does that mean?
I am using Diamond Drums here, but I feels like I should be using "at least some" Dyntime, DynLevel and Retrigger, otherwise it feels like using 0 for these settings isn't the intended use.