err... I don't remember a flamer being used in competitive for a looong time... Anywho, I will say that it's a great disabling weapon now, but it can also kill, which was my problem with the heavy carronade a while ago. Taking away the direct damage and leaving the ignition chance might be fine, or pehaps lower the ignition chance to 20% (because it's an even number ^_^), since it will only be able to kill if the engies miss a chemspray on the balloon.
If the direct damage is taken away, I can see double flamer pyras as a perfect "stall" ship that could make a flakfish ally viable.
I have one concern however: I'm afraid flamers might-out class the hwacha since the hwacha requires you to be very close to disable a whole ship, almost within flamer range.