A few questions...
Did you degas the wine when you racked it? It is critical to getting your wine to clear.
Did you add a clearing agent? If not, that would be my next step.
If you did add a clearing agent, I would let it set for at least another week and see how it looks then. I have one that is at two weeks and it isn't quite clear yet. You can let it sit for a good month without worrying about it sitting on the lees.
With a DB, you shouldn't need to rack multiple times. I rack from the primary into the secondary, let it clear, rack off the sediment into a clean carboy for backsweetening, let it sit for a few days and then either filter (if you have the equipment) or bottle.
If I do need to top up, I usually use wine not water. But again, this is why I only rack the bare minimum of times so that it isn't a big concern.
I wouldn't worry about adding another campden tablet unless you have to wait a couple months before it clears or you end up having to rack an extreme amount of times...but that's just me.
I have never backsweetened a Dragon Blood variety with brown sugar. I use either white table sugar or sometimes juice concentrate.
Just my two cents!