The Osiris-B is also the cheapest mech in the game by far. If anything, I think the configuration should be left alone and the price increased at least 10k. Seriously, a 30 ton mech carrying a (traditionally) 14 ton gun? Riiiiiiight.
edit: I just EASILY solo'd a Cougar-C with the Osiris-B, and the Cougar costs over twice as much. If anything the Osiris needs a nerf or big price increase.