@jolam,
that's right...assuming that you can switch your Xover to 2way configuration...you have to remember this always that whenever you adjust ch1 Xover points...you need to adjust your ch2 Xover point just the same...Why?...its a Linkwitz riley filter...what ever you take out from the Mid/Hi should be added to your Low and vise versa.
but again it all depends on your taste of hearing...if you need to overlap Xing its ok, as long as they don't produce comb-filtering.
If you are in the house of worship...and most of the time it is not acoustically treated...you have to lessen those 250hz at 400hz until it's intelligible enough for the congregation...again it all depends, wall to wall distance, floor to ceiling, front to back...this is very important to know, these are your room modes or Standing waves...if you know this it will be very easy for you to point out your problem frequency that causing reverberation.
have a nice,
jojo