Arby's Special Sauce

I've never tasted the stuff, but there seem to be a lot of people that think it's the best roast beef sandwich sauce. I'm doing RB in a few days and thought that I'd give the clone recipes a try. There appears to be two variants. One that's a spiced catsup with S&P,garlic and onion powder and tabasco that's attributed to Todd Wilbur. The other uses a small amount of catsup, a cup of water, lots of worchestershire sauce, brown sugar, cayenne, onion and garlic powder. This one is thickened by a corn starch slurry after simmering a while. Both recipes are widely published with little feedback as to the taste.
 
I made up both this afternoon and let them meld in the fridge a while. Neither tastes remarkable or according to my better half, anything like the real thing. 
 
Does anyone have a better clone recipe or another red sauce suitable for RB ?