Sgt_Kickaxe - 8:52 am on Jul 13, 2011 (gmt 0)
"All" comes before "Every" -- give it a shot...
I tried a couple of things...
I picked 2 pages in which I show "most" and stretched it to "all" by placing it in the title. My "all" ranks just ahead of his/her "every" still and the rest of the title is the same.
Result: the rankings didn't improve or decline but my CTR is back on both pages! It took a bit over a day for Google to update the page but the difference was instant afterwards.
I also tried two pages with the word "every" and both fell to page two a day later. Google really doesn't seem to like displaying several web pages with the same title on the same results page in the serps.
I'm going to halt making changes to titles right there though, it's not worth the risk of running afoul of some unknown algo metric.