DOTs work fine in UVHM, you just have to run the way you always do there - slag your enemies.
Getting multiple DOT procs on a slagged enemy will kill them clear through OP8 if you match elements. It does take longer on OP8, but that’s to be expected.
Which COM to go with would depend on your gear, IMO. All Catalyst COMs offer a ‘team elemental effect damage’ modifier, so given that you’re playing co-op you might well benefit more from those.
The Wired Catalyst (points in WDT) could be a good middle way.
If your COM boosts More Pep I would leave the build as is, otherwise maybe throw a point extra in there, especially since it works in tandem with I/O.
When I say ‘as is’, I’d still put a point or two in Shock Storm. The real beauty of Catalyst builds is in the synergies. The damage from SS is unimpressive on its own but starts to do some real work when EE procs (it should always be active anyway) and further boosts EB which in turn cycles back.
If you lack a Catalyst COM but have found (for instance) a Wired Zapper one, there may be a slight benefit to more of a focus on shock weapons as long as you’re aware of the problems with the boosts to electrocute damage compared to base shock.
Do note: That’s only if you wish for some more expediency in co-op play, however.
Element matching is always worth it, especeially when you find a Catalyst COM.
Since you’re going BFF you’ll probably wish to switch shields right after summoning DT, so while you’re in your inventory anyway…
For BFF, MoSS doesn’t do very much for you. I’d put those points in Unstoppable Force, which (like Maya’s Inertia) does an excellent job of defeating DOTs as well as letting you quickly close range and punish the one who put them there.
CE is some basic free damage, but 5/5 seems way too much, especially with only two points in Preshrunk.
If you feel you can get by without Discord you’re braver than I, besides giving up the clear benefits of Discord looping.
You did say you were expanding your horizons, though (^_~)
If it were me I’d go with something like this: http://bl2skills.com/mechromancer.html#153040151051142032030551412150110000
and let your COM flesh out the LBT tree. It’s unfortunate we can’t have two capstones and RA, but that’s manageable.
Hope something here helped, have fun!
I focused mainly on BFF and OC with my first Gaige so I knew how much benefit that has. As soon as I specced into it Hubby made a comment about it and now I think he’s taken a break from OC to work toward that.