That doesn't answer my query. I am not getting payouts above certain levels despite using more troops than necessary, which would appear to be a glitch With the system as it's happening to other people. 

Hello! Battlegrounds are one of the gameplay elements, it's an optional daily in-game activity, in which our players can, but not obliged to participate. You can try to figure out what's the most effective way to destroy Balur's Units, and what determines the size of your Rewards. But it's not a required condition for Battlegrounds raiding.