In light of recent Patch notes, I made this build With the added range quirks, I think this could potentially be a very good long-range build
The low mounts are the only problem, but it's certainly giving the chassis an interesting new edge to okay 'stock+'
Another problem is the gauss shoulder on an IS XL build but I would definitely consider it either way. The Bounty Hunter would already feel like a glass cannon with an XL but far more so with such a weak shoulder.
Ez Pz: fit a STD295 and you will solve most of your problems. With STD engine, you can also fully exploit the left dead side torso. My take: 1xGR, 2xERPPC, 1xJJ, 3 ton of ammo, STD295 MechDB link Fully skilled it is cool enough to be used properly (you will overheat at the 5th alpha with full skills): I've never overheated with this mech and if you position properly, you can side poke most of the times without issues (maybe ERPPC on arms are a bit too low) Or, if you really want some additional cooling, further strip armor, drop half ton of ammo, remove the JJ and fit STD300 and +1 DHS