I think adam's conservative--four sheds would take more like 12 weeks, 84 days, at a minimum, imho. In any case, the schedule you outlined makes more sense of that.
My guess would be that while animals CAN be acclimated to breed any time of year under artificial conditions, yours probably bred in prior years on a normal schedule, as others have specified here, and you're trying to change that abruptly--and, apparently, unsuccessfully.
May I ask why? If you can keep the temps up from oct to nov, then surely you could keep them up in your summer. What was the motivation to do the opposite? Did you breed your other colubrids on this sched? Were they animals you perhaps raised from hatching on a similar cycle, while these hondos were bought as adults? Most of us wouldn't try to do what you're trying...or if we tried it for some reason, we probably wouldn't be surprised if it didn't work, at least for a year or two.
How you get out of this weird schedule is a tough question. you mentioned a second, brief brumation "(ala double clutching)" but no one i know brumates to double clutch, just the opposite: aggressive feeding. However you try to unsort this, keep paul's comment about periodicity in mind, too: brumation includes altering temps, light, and withholding or greatly reducing feed.
good luck and i look forward to more info from you.
terry