Hm...Verge's goes by network hash rate, and not by pool hash rate? I find that my pool's hash rate being constant, but the Verge coins I'm getting (and percentage I'm doing) is wayyyyy lower than 2-3 days before. Difficulty's just being jacked up and up, and it's unanimous among different pools (I know cos I've just checked).
each algorithm has it's own difficulty. the difficulty has gone up alot since our recent upward trend in price.