It has not worked yet. P2ppool is steadily growing still, new miners have no reason to join a pool. Big system administrators will keep flexing on pools every now and then I guess, botnets too. I don't see us worrying once p2pool gets top 3 or thereabouts.
Nanopool of all pools. As far as I can tell both moneroocean and nicehash are still mining zephyr, we've lost some hashes there, on top of low price and high electricity costs for many, heat waves for many others... all in the middle of August when "nobody" is watching. Looks like a potential perfect storm.
Still, I would bet my ass THEY are still asleep. 51% attack makes no sense other than damaging the network. No gains to be made for any participants, zero incentives.
You do realize, part-time mining you could be shooting blanks for days mining on a smaller pool (p2pool included). Keep that "ANY centralized pool"crap out of here.
The 8 hours a day is what makes your situation challenging, more than the 7kH/s. Controversial as it may sound, I would consider mining on the largest pool I could find, the one that finds the most blocks per day, giving your 8 hours a better chance at getting paid. I haven't checked the numbers mind you, so DYOR.