I'll hop on the "fix it, dont perk it" bandwagon.
Above all, the wirby and the Osty should NOT be able to fire unchecked without a reload. I've forgotten the number of rounds each mag in a Wirblewind or Ostwind could hold, but even with a man on each side reloading a pair of 20mm guns, they are not going to fire contiously due to the over-heating issues. Currently, the wirby is a 3200rd liquid nitrogen cooled piece of hardware.