If it stamped a little splotchy, are you using a photopolymer stamp, as they tend to do that anyway with Distress inks?
I've just been Googling, and in
THIS VIDEO, Tim explains the differences between Inks & Stains. At 9.40 in the video, he uses the stain directly onto a stamp to stamp with, so you maybe don't need to use it to reink pads?
I also found
this :
"There are also a few things you need to know that Distress Stains are not:
A stain is not the same thing as a re-inker. Stain is a fluid version of a color, where a re-inker is a concentrated version of the exact formula in an ink pad.
You should not attempt to re-ink a distress ink pad with a distress stain. It contains different resins and will not work."
So,it looks like it won't do what you want.