FX FX m3 impact 25 cal 700 mm barrel. First 5 shots shoot 40 foot per second higher.

My impact holds perfect first and second regulator pressure upon filling the gun to 250 bar. It shoots 20 feet per second faster for the first 5 shots Which causes it to shoot one inch higher at 100 yd. I tape marked all my gages for 24 hours and they hold steady.
My first rag is set at 175 and my second reg is set at 145 Shooting AEA 34 grain pellets.
I'm shooting at 920 feet per second with a standard deviation of one After the first 5 shots. My valve is at 4 lines. My macro is at 7 and my micro. Is at 4. Feedback.
Would be much appreciated, thank you.
 
Photos added to above post.

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