Looks Tasty! My flat goes in the sous vide tomorrow. The point will go into the Baby WSM for pastrami.
my post mortem changes to this cook:
if you're using the amazingribs pastrami rub recipe, which the flavor profile is 100% spot on, i would do a full dust grind of the black peppercorns and coriander seeds. and omit the mustard seeds and double up on the mustard powder.
i grind my own mustard seeds to make my own mustards so getting to only mustard powder is quite easy.
reason for this recco is to create a pastrami rub that is smooth and you can really press into/on the beef. i think a very fine spice grind will help build a more solid bark when smoking the pastrami. not that what i did was bad; it wasn't. just that my memory tells me to just make it a fine ground powder and really apply/rub it onto the meat pre-smoke.
the water amount for the steam cook is really less than one inch. i would NOT go more than an inch for this size of brisket (1/4 tray sized). the amount of water is really just to keep the brisket moist as you get it to temp. too much water and you'll sog up the bark.
my bark had two distinct layers, the hard set bark and the larger corianders and chunkier black peppercorns softened up nicely from the schvitz but IMO were too wet (that's me being a highly judgemental b@#$%rd). so i recco going very well ground on the spices and really apply them and press them into the beef.
the schvitz, while cooking the pastrami is a fine line between adding moisture to keep the pastrami from not drying out to just keeping it warm so that you're serving a warm pastrami. too much water and your bark will get gooey. so err on the side of less and you can always add some if you temp check at the 60 minute mark of the oven schvitz cook part.
hope this all helps those that seek to remake this recipe/cook.
overall, we WILL be doing this again as everyone really liked it and with my wife having just been in NY and having eaten pastrami in the past few days, she stated mine was better due to the lower salt content of the meat and the overall tenderness of the cook. flavors were nearly identical so to me, that's a win because pastrami IS NOT the easiest cook to get right.