It does . . . consider the number of IS XL mechs that have 6 points of armor on a side torso, 1 hit gives you a crit chance on that XL, weapons, or ammo in that location. Eight SHL for the Fire Moth H against a 4/6 heavy? So . . . 3 gun, +1 for HL, -1 for TC, +2 for MM, +2 for TMM which means a 7 . . . with 8 SHL, its a very good chance 1 is going to hit a rear side torso.
I do not send the Fire Moth (or Phantom H) after a Griffin or Wolverine. I send it after a Archer, Catapult, Rifleman (oh yeah, most are great targets even with flips), Jagermechs or any of the other fire support- especially if like the Rifleman or Jagers, they sacrifice a bit of armor to mount those bigger long range guns.