The output spec for the XD-V35 receiver in the manual (p11) is a shambles! The XLR output is balanced and at mic level; the 1/4" jack is unbalanced and also mic level. The quoted level of 95dBm is just plain wrong!
I can't comment directly, because I have the hand-held version, but I've found plenty of output from the transmitter to drive a fairly insensitive input on my mixer/amp. I wonder if the 'audio present' LED on the body pack is lighting when you speak. If not, or only when you shout, it would suggest a fault either in the microphone itself, or in the pack.