Arguably, exposing Delta 3200 at 800 isn't pulling, since it's really an 800-1000 speed film (meaning: with most developers, if you expose it at around EI 800, you'll get a Zone I density of .1). Ed Buffaloe's results in PMK look good at that speed (check the unblinkingeye page referenced above). Microphen is a good developer when you want more than the ISO speed, so you wouldn't use it necessarily for EI 800, but you might use it for EI 1600 or faster.