I have mixed feelings about contacting the W. It sounds like she already knows about the affair from what you say, so what is your motivation for doing so? I don't know that info about the OM will help you in your sitch always? I do know that the OW in my case is quite different than me: I'm a sahm and 100% committed to my kids (probably had too much focus on my kids and not enough on my H in the past), and she is a workaholic lawyer and doesn't spend too much time with her kids. I bet in many cases, the OP are very different, the grass is always greener, etc. The knowledge doesn't really change me at all; if H wants a workaholic not interested in their kids, that is something I am not interested in turning myself into; I do wonder if he will eventually get tired of that. If that's what he wants then I am not the woman for him obviously.
I pray every night as well. I feel that standard DBing fits in well with letting God do the major work, but I feel comfortable that GAL and the other DB typical techniques are compatible with my daily prayer. Have you tried praying about your question about contacting OW as well and seeing if you are provided an answer? It usually does help me to pray about things that I am worried/thinking about like that. Karen