I can't be the only one that is seeing the constant fluctuation of serp results. Are they ever going to fix this. Or is that it the new algo, constantly changing the results on a weekly or daily basis. Every time I think they finally have things figured out, I see a new list that was cached some time in 2005. Plus lots of supplementals. A few days ago, the supplementals on my site disappeared. My indexed pages dropped to about 100 and then slowly climbed up to 150 indexed pages. I thought great, they have fixed it and are slowly reindexing. So much for that idea. Now I am back to 2000+ indexed but 99% are supplemental. My SERP for my keyword phrases are pathetic. How many months is it going to take to get the index organized? I'm sure I'm not alone in my frustration. I keep adding more content and can't event get the new pages indexed. It almost appears that they are trying to fix this bug on the fly. Each time they update the algo, they restore the cache from 2005 and sit back and watch the results for two weeks. Then they say well that didn't work lets make another change and again watch for two weeks. It seem like they are trying to fix the algo bug on the live DCs.
You are on the money! They do the Walmart Rollback Google is always tweaking things. They have multiple datacenters throughout the world. When Google rolls out a radically new 'algo' they don't feed this bad-boy to all their servers units. Some servers IP are blocked so they may test the new "algo" against the group of blocked servers. The updated servers or 'Google feed' you and I see were rolled back, (I'm guessing 6-8 months) so they can test the indexing speed of the new 'algos' against the old 'algo' or block IPs. Google (might) be doing this regarding their recent acquisition of the Orion algorithm.
I am not seeing constant changes on my prs. Are you changing your content a lot, and they are responding?