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This circuit is tempting for beginners to build because it's so simple, but it's simplicity is a problem. The way it's designed, it's performance depends a lot on the inherent voltage gain of the transistor, which varies from device to device. There are many ways to stabilize the circuit, and each will change the sound a little bit. Since you don't like the sound anyway, this isn't a bad thing.
For starters, you can take the stock components and connect the 2M to the collector instead of the 9V rail. This will give you a cleaner boost with less distortion.
Or with just a couple more resistors you could build the lovepedal COT-50 (remove the clipping diodes if you want less distortion, or put them on a switch), the LPB1 or any of the thousands of other common emitter amplifier circuits. Small changes to the caps/resistors/diodes/circuit topology can have a strong impact on the result (which explains why there are so many lovepedal products that are all exactly the same except for one or two components) so it's a good idea to breadboard before you build, and there's no single correct way to do it.
If you follow the schematics or layouts for most of these circuits, you won't need to swap resistors to bias the transistors. They're designed to make the differences between the devices mostly irrelevant to the circuit. (BJT's are different from Jfets in that respect.)
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