I shoot AD trads from 56# @ 30", drawn 30". I've shot the heck out of the bow, and those arrows and many, many other arrows from 2219 (95#) to 70# woodies for 5 or 6 years I reckon. My bow wants about 85#, and AD Trads w/ 175 grain points (125 grain glue on w/ a long aluminum converter, 37 grains) shoot excellent. And I mean excellent as in better than any other arrow I've tried, mostly I think because the aggressive nock end taper is more forgiving of my crappy form. My second favorite is 85# wood. I don't know about other "skinny" carbons, except that I tried 2 or 3 brands years ago and never could get 'em to fly right for me, or get the total weight up to my preferences w/out huge headache and hassle factor. Other than price, I could not want for a better choice than AD Trads. With the tapered design and 175 grain points I'd expect fairly generous FOC, but I haven't measured it. Don't know what exactly E-FOC is, but I ain't really into that particular hype, at least not at this time.
If not the ADs, I'd go to 2020s and 125 points, or 80-85# wood w/ 125 to 145 points. Again, not into huge FOC personally. With the cast we make with these setups, I just don't see penetration being a problem, unless for moose or brown bear perhaps. And I'd rather have the tiny bit more trajectory anyway. Perhaps I'm mischaracterizing whatever E FOC is.