I was toying around with the spreadsheet using my hunter alt (
The World of Warcraft Armory - Athanase @ Mal'Ganis - Profile) and I noticed something odd concerning ArP. I only imported my gear and (secondary) spec and put in an MM Shot Rotation and left everything else as it is, so no ArP consumables.
Gear Planner showed Saurfang's Cold Forged Band(H) as a ~30 dps upgrade over Seal of the Twilight Queen(H), just as expected considering that ArP is shown as better than crit and all other stats are almost equal. With my gear I'm 65 ArP rating from the cap using Needle Encrusted Scorpion. With the saurfang ring I'm 5 from the cap.
But when I switched the rings dps went down about 20 and the value of ArP on the overview tab went from ~2.1 to ~1.8 although I'm not over the cap.
I then tried hand adjusting some ArP numbers and noticed that ArP got better until 50 rating from the soft cap and 2.2 dps/rating. After that the value of ArP was dropping gradually until I reached the cap. After the cap it slowly started rising again.
I was under the impression that ArP got better the closer you are to the cap and doesn't rise and fall like that. Am I missing a piece or is something wrong there?