Well, removing the ant, and maybe compressing the chassis some would give us 6, maybe 7KG to play around with. From there, you could remove 2 Iron Spikes and stick some Heavy DSL Teeth or Spike Strips on. However, the meta for DSL 2.2 is usually "Bigger, heavier weapons -> more weapons, most of the time", and with HS, it's pretty much the case. So, I'd say, scrap the whole setup, and get yourself a DSL Bar with some hammers on the end.