Hello, first of all, don't mess with grain by grain. It's my favorite brand at the moment.
I even have to buy it in Caracas because I can't find it anywhere else.
Second, I loved that way of roasting coffee, adding flavors, although I personally wouldn't add brown sugar because it alters the roasting a lot.
And finally, I recommend that you grind little by little so you retain more of the aroma.