I was playing around with step mashing to get slightly better efficiency in my biab batch and for better control of the beer body. I am very new to home brewing and this was probably too much too soon. In addition I still haven't determined my efficiency to know what my target OG would actually be.
I started mashing at 148°F. The plan was to mash for 20 minutes at this temperature but my specific gravity seemed really low so I let it go another 20 minutes before raising the temp to 155°F, where I planned to mash for 15 minutes, but again my SG was off so I doubled that time too. I was expecting my efficiency to be higher than estimated and did get about 0.015 points higher than my recipe OG.
This was a mistake since I needed to calculate my efficiency for this new process. I should have just done a single extraction step at a single temperature that would have had more predictable results. I will do that next and use idoine to see if conversion is complete but I was wondering if I could learn anything from this process and if it was a good idea to determine my mash time based on my SG readings?