I'd be very, very grateful of any help and advice regarding the following:

I decided to do a DIY upgrade on my S200. Basic plan was to increase shot count along with adding a pressure gauge and quick fill.

So parts:

1. HUMA reg from XTX. (factory set to 95 bar)
2. Altaros Extra long Aluminium air tube (0.15L)
3. Altaros Quick fill and pressure gauge.
4. Chronoscope - Combro cb-625 Mk4

I assembled 1-3 and fitted the firing valve end plug from the old CZ / AA air cylinder. I filled the new cylinder (off the rifle), to the maximum 190 bar. and left it to see if it was holding pressure. Checked it a week later and.. Yep all OK. Good.

Next I removed the action from the stock and removed the barrel (sent it away to be screw cut). Then I did everything needed to the block (AT and TP) along with the necessary in order to easily alter hammer spring tension to achieve required power levels.

Today I put everything together, strapped on the combro, opened up a new tin of Superfields and sat down with pen and paper and couldn't wait to see the result.

Well... to say I am disappointed is a massive understatement. Just over 40 shots!.. and FPS variation and power curve not as good as an unregulated gun? Any guru's on here know what I need to do or where to start to get this where it should be? See the result from a 190 bar fill below - Ouch!

Air Arms S200 .177
14.05.18
190 Bar fill
RWS Superfields - 8.4 grns

Air Arms S200 .177
14.05.18
190 Bar fill
RWS Superfields - 8.4 grns

Shot No: FPS Ft/Lbs Pressure Check
1 774 11.19
2 777 11.27
3 780 11.34
4 776 11.24
5 774 11.17
6 776 11.24
7 774 11.19
8 780 11.35
9 776 11.24
10 776 11.24
11 774 11.19
12 774 11.19
13 774 11.17
14 776 11.17
15 777 11.26
16 774 11.17
17 776 11.24 150 bar
18 783 11.44
19 781 11.37
20 780 11.35
21 778 11.3
22 782 11.42
23 781 11.37 140 bar
24 781 11.39
25 784 11.46
26 785 11.51
27 781 11.39
28 784 11.49
29 785 11.51
30 784 11.46
31 783 11.44
32 786 11.53
33 784 11.49 120 bar
34 782 11.42
35 777 11.28
36 778 11.3
37 779 11.32
38 782 11.42
39 782 11.42 105 bar
40 782 11.42
41 785 11.51
42 779 11.32
43 776 11.24
44 764 10.88 100 bar
45 756 10.68
46 754 10.6
47 744 10.33
48 735 10.09
49 732 10.01