I use a similar laser hunchback to that. It uses all small pulse lasers, and I think a S245 engine? It pulls about 75kph. This was built before I knew how to use XLs properly so I'll go back and give it a redesign and possibly switch down to standard small lasers. Anyway, this thing just SHREDS assault mechs. All you have to do is stay behind them and hammer away at the rear torso. I think 7 blasts will kill just about anything out there. The key with the Hunchback, no matter what version you're playing, is you HAVE to increase it's speed. That thing is toast with the default engine unless you're going to just use a gauss rifle on the shoulder or something and play sniper hunch which is kinda dumb. I also use an AC20 + ML variant that I'm very successful with.