I am riding an 07 demo 7 with a dhx 5.0 coil. My current spring is 400#. I weigh 185 - 195lbs depending on my gear. Should I bump it up to a 500# or does someone know a way to stiffen it up a little without having to send my spring in or adding too much air. Isn't the capcity 200psi for most rear shocks???