There's Backfeeding Module if you want more ammo, the Mole if you tend to hide behind terrain, and Hellfire if you want set a group of bugs on fire.
Triple Tech Chambers is mostly for the effect of dealing high burst damage on high value targets, since the Autocannon is meant for controlling and clearing out lesser enemies.
Have you thought of using Mortar Rounds for this build? I think that Overclock is at it's most strongest when you're on a zipline, you're basically dropping down heavy explosive rounds down onto the bugs, plus the Coil Gun especially with Triple-Tech Chambers can be used for close range protection.
I tried Mortar Rounds a couple times. Effective as it was, it just goes through ammo too fast for the number of enemies I face on the hazard level I'm used to playing on. Toxin Payload just feels a lot more efficient to me. Much better crowd control without the awkward screen shakes or the risk of self-damage.
