DemonSS

I have had the crane cams tuner for a couple of months now. I've done alot of fooling around with it and this is what the outcome has been so far. I have 00 SS Camaro with off road y-pipes slp exhaust and all the free mods, msd wires and ngk tr55s slp lid and k&n filter. I had it dynoed before and after the tuner. Before the tuner my #s were 299 rwhp after was 308 rwhp thats only 9 rwhp increase. I did the high perfomance stockcam,10% advance timing, no enrichment. I was told that i would see a sure 20 plus rwhp to the wheels. What am i doing wrong?