With the air setup, I'm still not quite sure how I should go about it.

I've got it so that there is prob about 20% sag, but I still seem to sail though my travel. Should I just take my pump and repeatadly chuck my bike of the biggest thing I find, increasing the pressure each time until it doesn't bottom out? Kinda seems logical to me, just wondering if their is any reason why it's good to have a certain amount of sag, or if it's just a useful rough measure. Also if I put the negative air pressure higher enough, will this keep the first poition of the travel soft enough for smaller bumps?

I know you mentioned the compression, but is it better to just leave this on all the time, or have a higher air pressure.