So some quick comments as I wait this one out and will allow me to assemble my final thoughts in a summary post:
#1 - Don't wait to find "tart" cherries. Depending on where you live/season, these can be VERY hard to find. In the end, I called every produce stand and grocery store in a 10 mile radius for nothing. I went down to the local Nugget Market and checked the produce, denied, checked the frozen fruit section, denied, finally checked the canned fruit aisle and found 5 cans of Oregon Tart and 2 Oregon Dark Cherry. I bought all of what they had. I then checked the juice aisle and found 2 x 32 ox 100% tart cherry juice with no preservatives. I used the dark cherries + a 32 oz Tart Cherry juice in the boil and added 32 oz of the tart juice in the primary. I'll use the 5 cans of tart cherries in the secondary which will be just under 5 lbs.
#2 - A crock pot was easy to use but did require some "maintenance". I elected to go sour mash straight into the crock pot, but on "Warm" it would creep up to 130 F if I left it on endlessly. I started a cycle of ramping it up to almost 120 before I went to bed or work, then unplugging it, keeping the lid on it, and then covering in a towel. When I woke up or got back from work it would have dropped into the 90s, I would just ramp it back up and then cover, rinse repeat for 2 days. It wasn't bad, but wasn't hassle free like a smoker sounds.
#3 - I did the strike water to the grain and hit 152 on the dot for initial mash, but I immediately poured in ~1.5 gallons of 120F'ish sour mash which dropped the temperature about 10 degrees. In hindsight, next time I will use Option #2 to ensure maximize conversion. I think this is why my OG was low at 1.053 instead of the target 1.065. Lesson learned.
#4 - I tasted my 48 hour sour mash and it had some pucker but I will guess the dilution will pull a lot of that out of the final product. Next time I will definitely do at least 72 hours. Don't be afraid of starting the sour mash after work. It takes like 1.5 hour start to finish and is cake with almost no cleanup. Do it on Tues night if you plan on brewing Sat or Weds if you plan on brewing Sunday.
#5 - Due to the low pH I added yeast energizer and yeast nutrient (1/2 tsp each) to the boil. I oxygenated with pure O2, then put it into a Ferm chamber with 3 frozen 2 liters to a blow off tube. Fermentation had started this morning, so less than 12 hours later.
Not sure on how the Tart Cherry juice additions will play out or how much flavor impact it will have. I'll let you know if it comes out a Cherry Bomb!