I think Arc's of Sotek need to be taken en masse to get any real use out of them, like many things 1 alone is too unreliable to do much more than tarpit, but 3 popping out extra bases and using their shooting attack in overlapping bubbles could be effective...
On topic - By now everyone knows of my love affair with Razordons, but a large unit could also benefit well from swarm support to make all those skink attacks scary. My unit of 8 Razors could be rocking ~30 skink attacks, not hugely threatening until you tag on poison for ~5 auto wounds on average...
Also, don't be afraid to use them as chaff if the need arises, a unit of 2 bases costs the same as 10 skink skirmishers and thus is semi-disposable if throwing them under a bus helps you more than charging in to support a combat would.