Prior to acquiring my XL I experimented with various loadouts, all similar in sharing a single big gun and some additional firepower through lasers and missiles. After experimenting a lot and after regular updates to the structure and so on I finally managed to buy a 300 XL for it.
And the mech's performance exploded. I also know all the arguments about XLs, since these are discussed since their introduction in TT. Considering the Dragon's profile in MWO though it's more likeky to get you engine destroyed by damage to our CT anyway. Therefore the only disadvantage for me was not being able to use an AC20 due to slot space issues. Because of slot space I also changed the armor back to Standard Armor.
This is my current loadout:
300 XL, 11 DHS, Endo Steel structure, Standard Armor
Gauss Rifle (2 tons Ammunitiion)
PPC
2 Med Laser
SSRM-2 (1 ton)
AMS
89,1 kph including speed tweak
40 point alpha, heat efficiency 1.31
336/402 armor
As with the OP's recommendation, this is a rather expensive mech, and one has to get used to piloting a Dragon, but I think it's worth the effort.
Edited by Aylek, 22 February 2013 - 12:12 AM.