Daystate Renegade .25 HP having bad results , tips for improving ?

 i got a Daystate Renegade .25 HP, Unfortunately it gave me a bad results be it from accuracy, shot counts, spread... as every shot i shoot the velocity goes down so fast, i shoted 10 rounds started by 944 Ft/s and ended up on the 10th round by 870 ft/s using JSB MK2 pellets which i consider a bad results



I'm considering in getting a HUMA regulator to see if it can improve my results, would you please suggest what is the best scenario to be done in order to improve my renegade .25.
 
Its a brand new one, i have 4 airguns other than the Daystate renegade, ive checked with the dealer, no leakage, even shot around 1000 shots before testing it on a Caldwell Chroni, still results are too bad and specially without a regulator, this is why im asking to see if anyone had tried installing a regulator on a Renegade .25 HP and what was the results.
 
Something is definitely wrong here. DS has one of the best warranties in the AG world. 3 years on most guns and 5 years on new products. Make your dealer fix or replace under warranty.

1000 shots and still having accuracy, shot count and erratic FPS results is unacceptable, especially for a high end PCP. Why should you troubleshoot and buy a new HUMA regulator, before Dealer tries to fix it?

Need to know diagnosis first before throwing more out of pocket money at the problem.
 
Adjusting it by the hammer spring, which renegade u got and what cal and what r the results ur getting


22 cal. good results, very consistent.

920 FPS with JSB 18.13.

-- I should add that using the magazine I never shoot the entire 10 rounds. This is my second magazine with the same issue, after round #5-6 the accuracy goes all to hell.