Anyone brewed this kit? The recipe for the added sugars/malt on the can is a bit "fussy" so I simply added 1.5kg Light Liquid Malt extract. It's been bubbling away for three weeks now. Just about finished, now, but it's really surprised me how long it's taken. It was on a heat pad for two weeks so temperature was stable. Anyone else found this brew to take so long to ferment out?