Hi Jim
Wow! Another beautiful image. I can really appreciate it as I've had a go at imaging a couple of globular clusters (M3 and M13) recently myself (I've attached my image of M3 for comparison - my M13 didn't come out too well). There's so much more depth and '3-D'-ness to your image. And I really like the way you've captured colors of both the blue and yellow stars. My image of M3 was 10 x 300-secs Luminance, 5 x 120-secs RGB.
Unlike in my image, you haven't over-done the sharpening of the core (you can start to see dark halos around the core stars in my image). Looking at your image, it's almost like the core is slightly sharper than the rest of the image, which gives it that 3D feel.
Thanks very much for sharing your wonderful image
Russ
p.s. Meant to say that all my subs were taken with ACP 6 - I too was able to use of of the exposures (thanks to ACP and the SX AO!)