Failed Whiskey Mash - Everytime

[Mrschmitt]

I am trying to make my first whiskey. I am using the following recipe:

8.5 lbs. of crushed corn (sometimes called flaked maize)
2 lbs. of crushed malted barley*
6.5 gallons of water
1 package of bread yeast(Fleischmann's Active Dry works well)

The only difference is that I am using Whisky distillers yeast. I follow
super good cleaning procedures and everything soaks in StarSan for at least
30 minutes before I start. I cook up the recipe as the instructions state.
Siphon it all into a clean and sterilized fermenter bucket. The bucket has
a tight fitting lid on it, with a tight fitting airlock. Everything should
be fine. It always works for beer, wine and even rum, but for this recipe,
it never works. Both times, I have tried it it bubbles away and smells
great... for the first few days, but both times it turns into the most
awful "puke" smelling mixture. It is absolutely awful. With my first batch
I threw it away as it was just awful. WIth my second batch I decided to
distill it. I use a pot still with a 2 inch column. The most alcohol that I
got off of the still was 20%. I tasted it and it tastes just like it
smells, just like puke. I have saved it, in case I can use it somewhere
else, but my main question, is what am I doing wrong. I have successfully
made rum but the whiskey is the furthest thing from success. Any help or
suggestions would be greatly appreciated.