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Looks like you have a pretty good plan.
I would suggest 2 K-3's tho instead of the K-2's.
90 is pretty hot, even just to cure the rock. I think if you can keep it in the mid 80's you would be OK.
On the 2 extra holes you are drilling for your returns, this might be a little risky. I'm assuming these 2 holes will be drilled 1/2 to 3/4 of the way up the tank on the back?
If so...what happens if power goes out and your not home? The tank will drain all the way down to these holes. Just something to think about.
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