Honestly, the "juggernaut" of the Clans came when they were rolling over 3025-era tech. The average MWO 'Mech is 3050-era and generally a much more dangerous prospect than the SHS, no endo no XL no fancy anything designs the Clans were squishing during the early days.
Goodness knows I did enough fights like that in TT. Smaller Clan forces only won if you didn't press them, since your numerical superiority often let you swap out as you took damage, a Clan force you held in place tended to erode rapidly.