What's your hashrate? I also caught 6 blocks in 20m, but then 12h nothing 
54 GPS Nothing massive. 20-25+ blocks a day consistently.
Once in a while I'll run into a string of tougher blocks, but over all this is WAY more efficient than off LAN pool mining. I avg 2 to 3ms pings across my network that has rather mixed topography.
It's actually far superior for me personally because I'm on a 4G wireless connection so it's massively cut down on tx times for me.