I'd say, send a message to mod, he's the recordholder :P
Triple Threat: Won in 34 turns
your approach was correct though. abandon-kill the 20boss, that would grow over time in the first 2-3 turns. then get rid of the 400 boss (abandon works well here too) than whittle down the cloning boss. really sucks when a clone kills a stack of 100+ armies btw.