Mike, if you are using roll film, then attempting to use zone placement without using development controls seems to me an exercise in futility. If you are not busy today, why dont you try toning the negative in selenium and then printing it? You might be surprised as to the results you have already.
OTOH, why dont you try grade four, if you get too much contrast you can use some water bath, or preflashing techniques to lower the grade 4 a little bit. If you are using VC paper, then perhaps this is the time to use split filtering.
IMO I think, specially if you have gone back and reshoot the structure, that you have already the negative with all the info, you just need to do a little of darkroom work.
Perhaps a little story will give you the idea. I read somewhere that Fred Picker was making a print an he could not get the water portion just right. At the time he ran into Paul Caponigro and he asked him "How do I get the water to look like water?", thinking Caponigro was going to tell him a special technique. Caponigro's response was:
" Stay in the darkroom until it does!"....