Hey, we was in same situation. 2 groups in server, the second one has alts in our group. We use white list and we try use this alts. For example enemy group fight 10 or 8 field - one of them only each week, so if I thinking about any low lvl player that he is alt from second group, I put him for example to 8point field on 6th position, but he was alone in this field. Enemy group put their best team to 10point field, because they think we go 8 point field ....gnw starts and we won 8point field thanks this low lvl players for free, because enemy group focus other fields and 8point field they surrender :)

(Sorry for my english, I'm not native speaker)