Rolling Pin Tactician - fun & fast mapping, decent endgame potential

I kind of wandered into this build after running into problems clearing the Xesht +4 gauntlet effectively; my previous build relied on alternating between Explosive Grenade and Explosive Shot for early detonation; while this was dealing plenty of damage it wasn't doing well in high-volume situations like Breaches & the Xesht gauntlet.

I dropped a bit of damage on Explosive grenade, and started playing around with faster close quarters abilities w/ Flash Grenade and "when surrounded" passives. Then I realized as long as I'm rolling around like an idiot all the time I might as well drop Caltrops while I do it and that seems to be effective.

I've cleared Xesht +3, KoTM +3, Simulacrum +1, Arbiter +0, and pretty reliable juicy T16s. I think I can easily get to Arbiter +3 but the fragments are harder to come by this time around.

Here's some footage of the build in action:
https://youtu.be/5_qkYDoEhjs

Still goofin' with this build.

Current progress Xesht +3, KoTM +3, Arbiter +0, Olroth +0, Simulacrum +2.

Feel like Simularcum +2 was the hardest of these. Here's the last wave:
https://youtu.be/PRQVM0iZ85o