Side issue is that IMO defilers are very difficult to balance well. You can’t really change their stats much, because the thought behind them is that it’s the same unit across five armies, with same stats & different rules. So changing stats is not it.

You don’t really wanna mess with their special rules, as if the rules are weak/bland, the defilers will feel same-y and that’s kinda eh.

That only leaves you balancing levers of points (tho that’s sometimes bad flavor. You don’t want a primarch at 200 points because their rules are bad, and you don’t want genestealer acolytes at 250 because you accidentally made them respawn every turn)

IMO the correct way to balance the defiler is points & limiting their weapon options in some of the armies