Get the super shooters, they're great for the money.
If you mean the bushing on the sector gear, no it doesn't come off. It works like a delayer chip. It's fine, leave it alone. I have no idea on ratios for high torque but they seem to be suggesting the 32:1 set is for that very purpose so I'd go with those. You could go for the helical sets but unless you're either lucky or a shimming god, don't bother. Your gearbox will sound like a cat being tortured.