You should consider p2pool instead of solo. Your traffic stays local like solo, but your variance is decreased like it would be on a pool.
Come on Diablo, with 8 Th/s, variance is a non-issue. They mine 500+ blocks per month on average. They have more chances of being hit by thunder 10 times than to mine zero blocks during a specific month and being unable to cover their monthly expenditures.
Variance will only remain a non-issue if they keep adding hashrate so that they remain at a constant proportion (or increased proportion) of the network. As soon as the their proportion decreases, variance will increase.