Jan, I don't own a DVX100, so can't give specific advice. In fact, you're probably not going to like my advice at all..
Whether you're a carpenter, surgeon, machinist or videographer, it always pays to use the right tool for the job at hand. Could a surgeon operate with a hatchet and a hacksaw? Probably. Would the results be as good as they could be if using the proper tools? Probably not.
The issue isn't much different here. Weddings and especially receptions, don't have a lot of light. Your camera is a wonderful camera - top notch and high quality. But it is not intended for wedding work. Check your Lux rating against a VX2100 or PD170 (Sonys).
There is nothing you can do that will make your camera the right tool for wedding work. Nothing. Perhaps you can fix your red tones in post, if not in camera. Perhaps you could specialize in outdoor, daylight weddings. But for all-round wedding work, it is not the right tool. Period. End of discussion.
Having said that, I've heard of the DVX100 giving dull colors in low light, but not redish tones. Could be your camera has some particular problem?