Hey Joe,
That's awesome that you learning to tune your full size car by applying r/c tuning skills to it!! I would say from 22nd to 7th is quite an improvement. Good show mate!
BTW, depending on how well matched your cam is to your current head/intake/exhaust combination, you might be able to broaden the torque curve by increasing the lobe seperation. I believe you have dual cams on that motor, so you would have to have the cam gear adjuster. Also remember that advancing the cam timing will bring the torque down in rpm's a little.