If you play with HIP mod you may notice (may have noticed) that most nomadic countries have little to none armies and can be easilly disposed of. This is due to HIP "emf_defines" file crippling "max population empty holding multiplier" from 1000 to 500. It is supposed to be compensated with terrain modifiers implemented but it is not as those mulipliers can range from +100% to -33% depending on terrain type. What I recommend is to increase the "max_population_empty_holding_multiplier" found in "emf_defines.lua" file to 750. This should give nomadic nations a fighting chance.