First things first: Expertise rating of 26/26 and hit rating of 5% (with 3/3 precision).
*haven't looked at your armory, this is just the usual stuff*
Now, for ArP vs. Strength: That entirely depends on gear level. I am finding that once you hit around 4500 ap unbuffed, ArP will likely provide a more solid benefit than strength depending on the rest of your gear stats (you will likely have over 40% arp from just your gear at this point). This is just what I've noticed, and that is why I believe you notice the huge discrepancy in ArP vs. Strength. Both are good, but which is better is dependant on gear.
You'll want to use the greatness card and the needle encrusted scorpion for the procs out of those... unless you need the hit which is unlikely. For using the needle encrusted scorpion, you'll want about 53% ArP from gear/gems. (It's 52.3% or something like that for the exact number.)