Rick: I finally purchased the Umai kit to make this mettawurst. Since you are the most experienced in this process, I have to ask a question on how long to cure the 50 mm casing in the refrigerator. It looks like from your post that you had it in the refrigerator for about 10 days but said it could have been about a week longer. From Umai instructions they say 4 weeks plus for 50 mm casings. I also see the guide for the chub to decrease in weight about 40 %. What is the best guide in your opinion for this step in the curing process?