I've never liked Elixirs. Some guys swear buy them. I just don't think their tone is worth the extra cost.
You're using medium gauge strings....how thick are your picks? I ask because for years I was using thickish picks...not super thick but firm. After going through set after set of strings I knew something had to change. It was my pick. I've gone to a much thinner pick. Lots of give. Because here's the thing...if you're plugged in (which if you're playing in church I assume you are) as long as your pick hits the string, you'll be heard. I found I can keep strings on for much much longer.
To answer your original question....I've gone through a variety of strings over the years. My current love is D'Addario Phospher Bronze. I'm using med/thin.