Did some practice in vox machinae against bots.

The drill hitbox is really really tiny. 90% of the time I somehow landed on their arm and just rode on top of them for a while, or get my own legs taken off from a side scrape, or you land right in front of their weapons and take point blank damage somehow. It's satisfying when it works, but man it's just not worth it. goldrush or hopper ramming is just more reliable.

Every mech is armored enough that if you're firing continuously at them with any weapon, you will overheat before they take lethal damage, even lasers right to the cockpit, or dual scattershots. Maybe if you're really good with the railgun you can do it, but I couldn't. 

miniguns are pretty good overall, tiny heat output for steady damage and armor shredding. pulsars seem strictly worse miniguns on damage for heat. scattershots are okay at burst, but lasers still seem more reliable if you focus the cockpit or an arm. skyjackers are pretty awful against anything but hammers, and even then you might as well just laser the hammer out of the sky instead and have a more versatile slot. hammer itself is okay, but it's most effective as a short-range nuke, and has a really long cooldown. Railguns, missles, cannons, and lasers are all fine for their combat niche.

Air brake is a good module in general, it'll save your legs a lot. coolant flush is good on all the fat mechs, and ram-air intake good on the small ones.

goldrush/hopper are the best mechs overall when nobody's organized and you're just picking people off. dredge/catalyst fatties good if you have enough teamwork and mrechs to group up. Rook is kind of spicy once you get good at going sideways for mobility. drill is kind of nice for high-mobility railgun annoyance. I haven't really found a way to be effective in the overhaul yet, except raining down missles on the squishy top of goldrushes if they get too close.