See if you can set it for around 60%. It seems that 20% is just way to low. You will have to refill your bottle every day.

99cougar is right, you are supposed to be able to slowly introduce nitrous at lower RPM levels with a linear kit.

Black 2000 SVT Contour w/ Prairie Tan MSDS Headers | Magnaflow | Mirko Splitter | Fidanza Short Throw Shifter | Kenwood KVT-815 LCD/DVD