We are now 1% of the network.   
When we solo mined we stopped when we became only 1% of the network because variance starts to rear its ugly head.    We need all these spondoolies and ants that were delivered to point some here.   On average, we will hit a block every 16 hours so do not start to stress until it is a couple days.  It just sucks since the electric bill does not seem to share this variance in timing nor price.    But everyone is having a tough time right now (maybe the adjustment was too high).