I attempted brewing this a few weeks ago and think I may have had an issue. This is only my third brew attempt, all of them have been all-grain BIAB style. I followed the recipe (using the ~154F mash temp suggested in later posts) but noticed my OG was somewhere around 1.036, which is strangely low. I did overshoot the initial amount of water slightly, but only by maybe 1/4 gallon. I didn't realize this was so low until last night, when I went to bottle (mixed up the 36 with a 46). I took a hydrometer reading last night, and it gave 1.020. As a side note, I brew 2.5g batches.
I had originally tried the liquid yeast recommended, but it didn't take. It was one of those activator packs, and given the 2.5g brew size I figured I could just pitch it as is. After about 4 days of no activity I decided to use some S-05 dry yeast. I noticed fermentation within about a day. This was 2 weeks ago.
I'm not really sure where I went wrong. I decided against bottling last night (despite all the time I spent cleaning before taking the hydrometer reading), added another 1/2 packet of yeast, stirred it up and left it to go for a few more days, but I'm not sure what to expect.
Any advice on what may have caused the low OG, high FG and best steps to try to save this?