Small Changes vs Big Changes

Timeframe for results to show in SERP's

[graywolf]

I have a website that is a PR6 and gets spidered deeply and daily. I was doing an a/b test on a pge to see which got better conversions. The chnage I made was pretty dramatic almost 80% of the page changed it took almost two weeks for the changes to be reflected in the serps, despite being spidered a few times.

The changes I made were less than successful so I changed back. Again it took almost 2 weeks for the results to show the serps, despite multiple spidering visits to that page.

Two days ago I made a minor change, and the results appeared tonight. My position never changed throughout the experiment. Did I stumble across something?