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Fx wildcat mk2 0.22 power

I have an fx wildcat mk2 for a couple of months now. I learned that the stock (amp) reg setting was in 110bar and has 880 fps in 18gr pellet. 
I tried to adjust the reg setting to achieve 900 fps and end up with 125b reg setting.

I just wondering if i can benefit too with increasing plenum volume to achieve the same fps of 900 with lower reg setting. 


Tried to put 20mm spacer additional to the regulator in order to increase the plenum volume and reduce the reg setting to 110b.

With the additional spacer, i can only achieved around 880 to 890 fps.

is that velocity would i really expecting with that additional spacer or i missing something?