Is there anything to be done with stereo fields when mixing down to two tracks?

We prerecorded instrument tracks, played them back during a live church performance, recording the vocals and congregation. Used four small condensers (AT4041's) pointed from the stage in a semi-circle on separate tracks. Lead vocal on a Beyer M500 through a GR-MP2.

When I started mixing down, the stereo imaging and fullness isn't there. I've worked unsuccessfully with PCM 91 using delays and verbs to correct the problem.

Are there some phasing or mixing techniques I'm missing out on? What can I do to improve or correct the problem?

It's a praise and worship project and it's important to have the "live feel". Obviously, I don't know how to achieve that yet. :D

Brad or one of you gurus got any advice? (I'm to old to start driving a truck!)