I have active (Pedulla MVP5), passive (Rick 4001) and Chapman stick. I don’t think the active thing makes a difference here, though I don’t usually boost treble. Don’t notice any difference between the basses for triggering. The Stick is better though.
I find it is lifting the finger off the fret which causes most issues. The little metallic crunch of release seems to have enough pitch info to trigger MB2.
Muting the open strings with a hair scrunchie or Gruvgear Fretwrap helps.
Also avoid very short attack settings on Synth envelopes.
Using MG2 set to drop d tuning for notes above D string pitch and MB2 for notes between D string and low E is cleaner. (MG2 seems to track that range better and is polyphonic. MB2 doesn’t currently go lower then E 
) Mainstage and Gig performer allow you to filter out note ranges so the MB2 and MG2 don’t both try triggering the same note. This MIDI Machine looks like it does the same thing…