haha Ive got the exact same speakers and Sub
lol
However i dont get the problem with the radio that your having so im guessing its the head unit man. Does you head unit have controls for the sub? Just adjust that along with OBV general bass n the controls on the sub itself at quite a high volume, so you get the desired effect
This hopefully should make it so that at medium levels the sub isnt all over the place lol
oooooooooooooooooo ..... plus i would recommend sealing the sub if your going to listen to the radio lol