I don't think anything is gained by going too warm. My last batch was held at 85F for 4 days as a starter, but it was the Omega Lact blend (Brevis and planetarium blend).
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Your pH was not 3.2. It's simply not possible just from several tsp of minerals; you'd have to add a LOT of actual lactic acid to get to 3.2. 5.2 perhaps, but 3.2 no way, no how.
By the way, you should never ever ever use minerals to adjust pH. Minerals are for taste. Use acid (lactic, phosphoric, or acid malt) to adjust pH.
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