I use digital Recorders as well. I have not had the problems occur that you have described.
I connect a lapel mic to the Recorder just like with a wireless mic.
Most Digital recorders have two settings. High gain and Low gain so that it can either record close-up or it can record everything.Make sure you have it set correctly.
My advice is to test the mics before the big day and make sure you have the settings right.
Good luck.
