Advice needed on mic/line settings... On shoot now and need tips as soon as possible

Hello. I'm on a documentary shoot now, running 2 sound sources into a shure FP33 mixer, and sending the signals wirelessly to the sony ex3 camera via a CR185 wireless system.

My question is about line/mic settings. What should i set my mixer output and camera inputs to? Been doing some tests and here's what i've found so far...

When we have both mixer output n cam input set to line, levels on cam r really really low. When both ends r set to mic, level meters look ok, but signal sounds distorted. Any advice? The prob goes away when mixer n cam r hardwired instead.

Thank you.