FX 30.cal Hybrid Slugs

I got my hands on some FX 30.cal Hybrid and this is what happen next with my Fx Bobcat four shot group at 40 yards 
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I was hoping someone would start sharing some experience with them. I ran some through my Impact compact and they grouped well at 30 yards but opened up to 3” at 100 yards. Same settings as I purchased it with shooting JSB 44.75 at 870 and the hybrids 10fps slower. Bumped it up to 930fps with the hybrids and same grouping results getting only slightly better with some valve adjustment. 


Curious as to what speed was working for others I looked into it a bit and it seems my 1:37 doesn’t look like the tool for the job and a 1:26 is on supposed to be out soon.