I switched from BTCG to DB due to the DDOS (why are botnets so bad anyways?) and so far it seems my payouts aren't nearly as high as when I was with BTCG. Sure my uptime is better, but whats the point of being connected 100% of the time when being connected at <24/7 yields more profits (in my case anyways).
There was also just a difficulty increase. This may be why you see less earnings. Just one other option to consider.