I shot ACCs last year (3-49s). I got a bunch on the cheap (missing two arrows out of the box, so they sold them to me for $2 a shaft.... heck of a deal).

I shoot a HCA Iron Mace. Just like your X-Force... it has a pretty aggressive cam. My finished arrow length was/is 29.5". I was shooting a 100gr tip, at 62#s... and I was getting a weak arrow reaction. Granted, my arrows are a fair piece longer than Robs... but my bow is tuned extremely well.... I did a little horse trading and got a pair of 3-60s since then, and I found that they shot much better than the 3-49s did. I shot a few without fletchings (which is pretty revealing) and found that they flew much like my fletched arrows do... the 3-49s had a fairly bad kick.

As much as I like them though, they are expensive.... same spot I picked up my 3-49s real cheap had another good deal going not long ago... so now I'm shooting a 340 St Axis with a 125gr head... and my arrows are flying as good as any ever have off that bow.