Dude, you are asking a most totally subjective and unanswerable question. If you can't get the sound you want out of your gear change something. If you can't get enough gain, get an overdrive pedal, or get a new amp. Use your head a little. Turn the fucking knobs. Figure out what they do. If one of them doesn't turn far enough....get a pedal.
The tone has alot to do with the amp. Maybe you have the wrong amp. Tone is in the fingers too. Maybe you have the wrong fingers.
I can't believe people look to the internet for advice on how to dial in THEIR OWN AMP. I mean, come on. You're sitting right there with it. You're the one who knows what the knobs do to the sound. You're the one who knows how much gain it has. You're the one who makes the call. Learn what your amp can do and then either address the shortcomings or replace it with one that does what you want. Easy. Have you spent the entire 15 minutes it would take to completely analyze what it is capable of in every configuration? I mean I know that's asking alot, but you should think about it. I can only assume you have never done this.
Set everything in the middle. See what it sounds like. Figure out what you want to be different about it and then turn the fucking knobs. Once you turn one knob to some totally bad-ass position, turn that other fucking knob over there that you didn't think you wanted to fuck with at all and see how it interacts with the first knob. Knobs are like women. You might be getting along just fine with one of them, but if you fuck around with a different one, the first one will treat you completely different. This is just called learning your equipment. No one can possibly do a better job of this than you. Do it.