I know this is going to sound like sacrilege to a lot of people here but I don't play with jump jets. I always remove jump jets when I get a mech that has them and replace them with armour and heat sinks. I also tend to drop any excess weapons as well. I prefer my mechs to run as cool as possible and to have as much armour as I can manage, that way I can keep up a high rate of fire turn after turn, generally while closing range, and then move in with melee attacks when I've built up too much heat. Although I do like LRMs I like to concentrate them on a specific fire support mech like a Catapult, and I will replace LRM's with SRMs on anything else.