I'm trying to push/pull less, and just use the right film for the job. Sometimes you have to adjust though, like those campfire pics, which were awfully dark. I pushed to 800 just so I could hand hold the camera at f1.5. I think I was using 1/15 second for those which is hard, but it would have been worse at iso400.
Still working through my stash of HP5, which I haven't liked from the start. I'm committed to 'wasting' it whenever I can.