Here's my vMachine build.
I'm working on making a 2nd one though, which will make it the first time I'll have two separate builds to use for vMachine.
1 sub of
iss for double Fizzy with max
LDE effects, 2 subs of
scu to bring 220p Booyah down to 209p, and a main of
ism helps with holding down an area for longer.
They're also the abilities that I can (and probably should) change for something else but they're what makes the weapon feel comfortable for me.
Machine fire rate nerf makes it harder to stay alive so I spent a whole main on
ism just to have more sloshes to work with, making it less punishing when I miss a direct. It's still not necessary though, the only amount of
ism you really need on vMachine is 1 sub for an extra slosh.