I've been looking at this ever since I came up with my timberwolf build that does the same + SRM18. It almost feels like the Huntsman is the more reasonable way to do this. Not that I do reasonable very often.
Ok I got rid of the reasonable. I stripped all your heatsinks for SRMs. Bait a big mech onto a flank, splat it and run like hell. No other job. Might be able to drop a bit of armor and a bit of ammo for a couple DHS. Or go down to SRM2s.