You might consider reducing the main/recoil spring weight. Wolff springs sells reduced spring weights for the P-08.
Is your extractor attempting to remove the spent brass?
You will most likely have to "play" with different approaches to get you P08 to function correctly. I would be very cautious about trying to reload the 30 Luger brass to a lot higher velocity level than factory. You well have a new strong steel barrel, but have a 90 year old frame and toggle assy.
If you are a reloader, you could produce a small number(say 10) of each powder level, increasing 0.1gr of powder for each group, watching very closely for over pressure.
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