That's good advice at one level, but in addition, you as the primary sound guy, should have your IEMs set as post fader or just tap the FOH mix. If you handle that and can keep your own perception in line, you should be fine. Just remember that guitarists tend to expect more guitar and bassists expect more bass and drummers, well you get the picture. You might need to use an Aux tailored to your expectations. You do have the advantage of being used to the IEMs. One thing that I recently realized is that IEMs can be used to make the band louder. I always expected they would be used to bring stage volume down. Might want to decide what direction this group needs. I wish you well.