So I have a very simple RIMS system with pump and direct fired kettle MLT wrapped in reflectix. I will eventually upgrade but this is for starters with the money I have now. I regretedly got a cheap thermometer for the thermocoupler and it does not respond very quickly. Anyway, I was going for 152 mash temp. it stayed at 158 for about 5 minutes in the beginning, then dropped to 154, then dropped to 152, so I walked inside for a bit and when I came back 10 minutes later it was at 145, so fired it up a little, and slowly got back up to 152 in a about 5 minutes, where it stayed until about the less 5 or 10 mintes when it started dropping to 148, but then I started with the fly sparge at 168. What I can expect from this?