Try This

First of all boost the Vocals at 4k by about 4dB with a fairly open Q - then add a high shelf at about 8k of about 2dB - this will give the vocals a much more open sound.

Next use a multi-tap delay plugin. Set it to 2 taps with a short delay (12-40ms is good - or if the plugin supports it, tempo match the taps at a 32nd and a 16th. Pan the taps hard left and right and make sure they are at about -4dB and -6dB respectivly.

This should open up your vocal sound nicley.