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Edgun R5 Help

I have an Edgun R5 Super Long in .30 caliber. The gun was shooting the 44 grn. JSB pellets at 870fps with the Huma regulator set at 105 bar. I wanted to get more accuracy at 100yds. +. I ordered some 47.2 grn. slugs. I turned the regulator up to 135 bar and increased my hammer spring until I reached max speed of 935fps. I backed off to a consistent 917fps. After making these adjustments I have two new issues. First is my safety works fine with the gun uncocked but when you cock the gun the safety will not engage no matter how hard I try. Second thing is that maybe once every 10 shots or so when I cock the gun the sear will not stay engaged and I will have to cock the gun again in order for it to fire. If anyone has any ideas I would love to hear them. Thanks