With eyes off or faulty you will always be capped at around 11BPS.
To lift that cap in EYE off mode, you need to go into the menu by pressing the RED button inside the grip..scroll till you get to TIMG then hit the middle button, then scroll to CON and hit the button, lower it from around 65ms to around 40ms...this will cap your gun around 20 bps, assuming you don't fiddle with anything else...only problem is, if you have eye failure later on you will be able to shoot 20 or so a second...so...for fun set it at 40 or less, for use if required, leave it at 50, which is about 14 bps.
Really you should set your marker up properly, but it can be a bit complicated and ideally you need air, paint and a chrono to do it right.
Will only work in semi 1, all other modes are capped.