Need less fps

[Syko89]

Ok hit a snag on my fsr mag. With the red spring I can only get down to about 270ish fps with normal paint this puts Fs rounds at 290-300 and field limit is 270 "stupid whinny kids" . Normally I would drop to the gold spring but that would be to hard on a Fs round that did get spun around. Any other tricks to get the Fps down and still have a gentle lvl 10

Classic valve with stock on/off
New reg piston
Cleaned and oiled
1100psi input "only tank I got"