I used ROP against arabia and Germany only really.
I did play open, had only a few extorsion attempts. You can read my first spoiler to see when i traded contacts. etc.
I don't think trading contacts should have been much of a problem this game.
I had 2 EMPTY goody huts, no more than that.
I can't find your first spoiler, so can't compare things in there. I have seen only sir pleb come close with 20 workers though (i had 22+7s) other players had significantly less.
I am still convinced this is the primary factor to succes.
I also saw some players not using the warrior to swordsmen upgrade, not doing that would also cost some time.
I also want to add however, had i done anything different costing me x turns by itself, it would probably have costed at least double that in reallity. This because:
-some AI would have been finished off later, allowing them to help persia with research and trading a bit longer. Now, after the first MA techs, Persia has been doing research all by itself.
-Had it taken any longer, i could have been forced to go for cavalry instead of knights. I was pretty close to the point of needing those.