I do all of the above - dry hop in primary with finings, and wash the yeast after dry hops. Just don't do all three - if you wash yeast after finings, you'll harvest the finings along with the yeast. Can't remember where I read that on HBT, but I just remember seeing that washing + finings is no good.
Sincerity is everything. If you can fake that, you've got it made.