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Wow... that looks great. Not sure about getting the seasoning under the shell but if you're trying to get the meat seasoned I'd try a classic crawfish boil technique that lets the lobster sit in the seasoned water. You'll want to stop the cooking process by adding some ice (I prefer frozen water bags which don't dilute the boil). Let it soak for 30 minutes - the longer the spicier. We do this with shrimp all the time and it works great until crawfish come back into season.
Yes, I'd like to second this.....
With crawfish boils down here, they generally use the same pot over and over and just keep adding seasonings to it as they go....
Hence, the latter batches are usually tastier and a bit spicier...
But one of the main things they do, with the HEAVILY seasoned (and I do mean heavily seasoned) water....is boil the critters to the proper point and then cut the fire, and either dump ice in, OR, I've seen set ups with water hoses hooked to rings that go around the top of the pot (outside) and run water down all sides on the outside to help cool it off quickly.
That letting the food set IN the seasoned water is a key point.
And although a crawfish is much smaller than a lobster, their body are largely the same...so, the methods should work on both....
That does look really GOOD this morning!!
cayenne