Call Dan Miller and talk to him.
I was told a few years ago, and I guess it is reasonable as well. While you can take a trigger for a gun and make it extreemly touchy or light on the trigger. While that could be ok with guns, with crossbows, there are greater pressures applying to the trigger assemblies (150-225lbs). I commend you in wanting to have someone, a professional to do the work you want, but I would also recomend you work with crossbows personal, not just a gunsmith because of the differences and the safety factor.

Again, contact Dan Miller or the factory.