"Perhaps I could help you with that hump" "What hump?" Why XL engine? Because you are a real man... And because if you fit a LE and someone pops you left torso, your heat dissipation is gonna be so awful that you won't be able to shot again after ages. Be mindfull that with actual stats in place, you should be around ~25-30ish percent heat efficiency, which is low, so use this build at your own risk if you haven't skilled this build yet. If Smurphy is not fooling me, you should have 350 (rounds) * 4 (tons) * 1.2 (ammo skill bonus) * 0.9 (damage per round) = ~1500 potential damage... Which should be enough considering it is a medium mech. ALT: if you REALLY want to use a LE, but it ain't worth it ... Or you could use 2xRAC5 and STD engine, but there are better mechs to do this job, like the bushwacker, due to the fact it can fit a bigger engine and have more tonnage available.
Runned out of ammo, actually missed some shots. Build is actually good if you manage to not get focused immediately.