Jacks in jumpbot mirror?

I just watched a very interesting 1v1 between lostconnector and Myopic, where lostconnector had a huge metal advantage but still lost. He switched to ravens about halfway through, and jacks beat him hard. I know moderators would've been an OK counter, but how would you get the dps down?

One of my ideas would be a mix of jacks and moderators, creating a good mix of slowing the enemy jacks down and then out-dps'ing them.

Another idea would be to switch facs, but I don't really have an idea of what fac would be good.

HOW TO WIN MIRROR
Step 1: Resign
Step 2: Play anything but mirror

(note: only cloakbot mirror is fun to watch)

[Spoiler]

that's a beautiful image

What dosen't counter jack? Pyro is probably the best raider to counter jack, along with bandit. Mods slow down jack (which is really bad since it already has very low range and very slow). Placeholder is an obvious counter. Juggles can push away jacks. I think jack is the worst unit to build in a jj mirror. If your opponent is only building jacks, even skuttle could be a possibility.

Or better, post the replay