I was messing around with using the tank to get on the guard tower, and a bad jump made me notice that there are invisible ledges on the corner poles of the guard towers. This involves two "jump backwards into double-jump forwards" tricks. I haven't actually gotten a full run with it live yet, but it should be somewhere between 8-10 seconds faster than the tank skips.

Newest and most optimized Destroy Comm Towers route as of 1/21/18