Sorry was out of town. I thought I answered this in a PM.
I would add honey, or if it is easier, golden syrup. Both work. I use honey.
As for flavorings, I would add some ketchup and molasses to make the comparison work. 1/8 cup of each. Or, just use 1/4 cup ketchup as that will give you a nice red sauce. I would add, this is more of a mother sauce, which I often just add stuff to make it work for how I am feeling. It is a sweet and sour base from which I can work. I would say that with the ketchup and/or molasses, it will work best with pork and with beef.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."