Huss, it's hard to say precisely what the exposure settings were, but I can offer at least some ideas. I shoot HP5+ @ 200, or roughly thereabouts. I generally take a couple meter readings when I start out, one in bright sun and one in the shadows, and basically work with those as my min/max parameters. Individual shots are just on-the-spot guesstimates. When in doubt, I erred on the side of greater exposure.
I develop in Caffenol C-H(RS), which is a compensating developer and tends to work pretty well for me. It deserves at least some credit for managing the fairly high contrast lighting.