When I've used W/D/W it's been like this: Distortion/fuzz/overdrive to all, modulation, delay and reverb to L+R. If I am using a pitch shifter, depending upon what I am using it for dictates how I deploy it. If I'm using it as a whammy, then dry to all three; if as a detune Left and right 100% wet.
I think a great thing about W/D/W is that you can get that punchy dry sound down the centre, and also have a nice bit of reverb at the sides. This can compliment the dry track, rather than making it untidy. Please pardon me if my use of the English language is a bit lacking.
I think the main thing to take away is just to mix to taste, and try different things; but you probably know that already.
Please may I ask, what rig are you running?
