So I watched a video on decoction and the narrator was using iodine and chalk to check his mash conversion. So I tried it and during my decoction and mash I watched the reaction slowly change as there was less and less starch. My question is, when I'm doing a simple mash, not a Decoction, should I hold my Sac rest temp until I get little to no starch reaction from the iodine test?