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That is sacrilegious - don't geaux preppy with the bugs :S
I have had crawfish a few places in Texas and they were terrible. Boiled with salt water, then placed in a cooler and seasoning added on top.
Problem one - The tails don't pick up the seasoning
Problem two - Because the seasoning is on the outside, you can't suck the heads. Pepper gets all over you lips and mouth (I'm not kidding)
Get some Zatarains or Texsun and season the water that you are using. I go with with 1-1/2 times their recommended amount. Get the water boiling and add potatoes and corn - boil about ten minutes, add the crawfish. Boil for three minutes after the water comes back to a boil then shut it down. Soak for 20-40 minutes (this is when the bugs pick up their flavor from the seasoning). Try one after 20 minutes - if the seasoning is fine take them off. If you want more seasoning in the bugs, soak a little longer.
Unless you have a humongous pot, I would think you are boiling multiple batches. My equipment would dictate no more than 40 pounds/batch.
Good luck with it