Do you really think you need the extra-jump jets? I admit I don't see much room of improvement on the default build.
Stock build is great, 4 JJ is a bit much as is the Heat efficiency, but you can edit the stock variant to mount an AMS instead:
As this thread is basically for optimizing the stock loadout this seems to be the best place to present the following twist. This is the build I am currently using. I am considering switching to a STD 225, though, because this allows to remove FF from the mech, which in turns allows to switch to XL builds without spending money each time.
The stock Arrow is excellent. I do agree that two tons of ammo is ideal. I changed the CT armor to 44/12(I may eventually go 46/10). I put one ton in the head and moved the jump jets into the torso to crit buffer the heat sinks. I am either going to run max jj or go down to one and run AMS.
