Could you give me a little more detail about this? The only multi-filter technique I've used so far has been to expose at grade 5 just enough to get a black (or a little less), then expose at 0 to get the midtones where I want them (dodging and burning the 0 exposure only). Is what you mean?
I put one of the pictures at http://inauspicious.org/photos/lm6/038/14/. That's just a straight print at grade 5, with just enough exposure for the blacks to be black. Note that my scanner puts a really odd tiger-stripey pattern in dark areas, that's not on the print. There is actually detail--just--in the woman's clothes and in the shadowed area to the left of her head, but they are probably a bit blocked up. I don't really know a lot about dodging and burning, the only thing I would think to do here is burn the spotty wall to the right at 0 to lower the contrast on it, and maybe burn the buildings and sky to the top left as I think they're distracting. What initially prompted me to post, though, was that the picture was already too dark all over in the grade 5 exposure... usually they end up black and white and nothing inbetween!
This shot seems like it should print incredibly contrasty at grade 5. It's already a hard angled light shot, with inherent natural contrast. I think your G5 filter is acting more like a G2/3.
Thin negs can make some wonderful lith prints as well.