I am having the same problem with the last two batches. Brewing IPA full mash method. After the boil 1hr 10 mins chilled the wort and took the reading and tasted spot on. transferred to the fermenter and checked reading in 8-9 days and again spot on however when I tasted the fermented beer it was awful, tasted like ash/burned cigarettes. I noticed that the kettle prongs were black and cleaned them before starting our next brew a week later. Again, All the processes were great until trying the fermented beer and got the same result of ash flavoured beer. Not using DME or LME so cant think of anything that will burn but the hops? not too sure what the actual cause is or how to fix this. Very annoying especially since my first two brews turned out fantastic. Help please.