Huben K1 accuracy with 25 gr. at 700 to 800 fps

This is what I am getting out of .25 caliber King Heavy MkII at 40 yards. It always throws one or two.I'm still trying to find a good setting. The regulator is still very slow to refill...but it is still a new rifle. On my other hand,I can hit my 230 yard hunk of tin (2'x 4') nearly every shot. 

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I want low velocity with 25 gr. .25 JSBs for pesting on a house lot in a semi auto. Racoons, squirrels, feral cats. some crows and pigeons. neighbor lady on the block is feeding them all. I've been looking into the LCS SK -19. I has semi auto and large capacity mag in .25. It seems to be a cross between an impact and th huben. I read they are assembled here from foreign parts. Lother, walther barrel, some asian parts is all I've read. I have an Impact, bobcat, talon, several dianas.