Hi All! Came across an interesting issue with my last brew day, and I would welcome some insight from the more experienced brewers here. Attempted to make an Irish Red (which turned out more brown than red) and using the Brewhouse Efficiency Calculator (linked here : https://www.brewersfriend.com/brewhouse-efficiency/) I determined that I had a conversion efficiency of 94%. Specific gravity of a blend of both runnings was 1.046 - maximum yield was 1.049 according to the calc. I then boiled my 8 gallons of wort for 90 mins, and was left with roughly 6 gallons of wort at 1.044, resulting in a "brewhouse efficiency" of 67%. So I was left wondering: Is the conversion efficiency a reliable indicator of post-boil OG? My recipe target was 1.060. I was hoping an extended boil would raise more gravity points than 2. If my target OG was 1.60 as indicated in the recipe builder, with an efficiency set of 75%, is there a reliable way to predict that based on pre-boil readings? I thought it odd that my first runnings read a bit low. My typical brew (golden ales and IPAs) get a much higher reading. For more information, I brew all grain in a converted cooler as a mash tun. False bottom holds maybe a half gallon of volume, and I left a half gallon in the kettle, minus the trub. I used 8 gallons total water, 5 for mash, 3 for sparge. I boiled 7.5 gallons of wort on my stovetop - so not a "roiling boil" but it boils nonetheless. I typically lose just shy of a gallon per hour due to evaporation. I would love to hear anyone thoughts on this! Thank you so much in advance! I've been using this site for a couple years now, and even though I don't brew as much as I'd like to, I truly enjoy the process and I appreciate the great brewing minds on here - I've learned a ton just reading your posts!