This is pretty much exactly what we did (Destiny)

by Speedracer513 , Dallas, Texas, Wednesday, October 05, 2016, 10:11 (3063 days ago) @ Beorn

We were running without Weapons of Light, but that’d be a helpful DPS boost. The Cannoneers would be able to get to the bubble and back to position pretty quickly.

Hopefully you're saving the cannons for the third round of dps each time. They do way more damage (with a charge-up) than anything else can. Important to note through that Weapons of Light do not increase Cannon damage, but a shadowshot tether does. Having two tethers is super effective - especially if they're saved for the third round of dps (and coordinated do that they aren't fired at the same time, of course).