Amccoy, I'm unable to see the pic you attached (possibly a bad link?) so I'm not sure what your 9 shot group looked like. I can tell you that my .25 AT44 Long loves the new JSB Heavy MKII's. Half inch groups of five shots at 50 yards are not the exception but the norm for me with the MKII's. I haven't had much time to fine tune them at 100 yrds but the couple of groups I did try were right at 1.25 inches (by comparison the lighter 25 grain JSB's typically grouped closer to 2 inches at 100 yrds).
I've also tried the H&N Grizzly's. They would be acceptable for hunting at 50 yards (1 - 1.5 groups), but really start to open up for me at at any greater range. I shot them a few weeks ago at 75 yards and the groups were on the order of 4-5 inches! But some others report better results with these, so you really do just need to try different pellets to find out what works best for you.
Enjoy your new air rifle!