Slightly random question for you...
Just going back to your tropical stout, not sure if you remember now but do you know how you set your Klarstein for the mash?
You said here you mashed in at 68 - do I read that correctly as you set it to 68 and just left it overnight?
Frankly I'm trying to work out what you did to get this to go from 1.067 to 1.012 and why all my dark beers stop around 1.020 - tell me your secrets damn you beer whisperer!!!
I have a theory but unfortunately your result here scuppers it
Having said that, there's lots of fermentables in your recipe and only about 9% dark roasted malts (rather than 36%), so that might have something to do with it