I mention the meteorite guards (and other tougher units) because they're the obvious counter to swarms of chaff. Chaff > snipers > elite units > chaff. So, against R'yleh I recommend you skip the elite units since they'll be using lots of snipers. Your (buffed) chaff > their (unbuffed) chaff, so you *in theory* you should have the upper hand so long as your own snipers can handle their elite units. Against real players...actual results may vary.
