I don't even use the stuff on the shoes I make. If the leather isn't tanned right or was hard to ..."read"... before beginning work you can actually see little crystals that look like sequence forming when the work gets dyed. Wood can have its own personality just the way leather can.
Part of it is whether you used their oil based dye or their regular dye. Oil based dye is better confined to leather...mostly...
Take a SCRAP piece of wood and try using the dye to whisker on the first run, thinning it with some alcohol. Go back to either water or alcohol or whatever you use for the second or third run. Then segment the piece and try some various browns and tans for your final color. You'll be surprised at the effects, and even a cursory view of your talents shows that you will master the touchy-feely part of making a pleasing color.
You have a lot of good advice in this thread, and, in spite of your reticence, the gun is very good looking.
Lastly, I just built a small smoothbore out of excess or scrap parts. I found the best application for any black dye at all was to highlight repairs on the stock because two years ago I botched a lot of work on one of my first builds, tore it down and used other parts to re-make it into this piece.
What I learned was that, if applied sparingly and later over browned after whiskering, I got an antique look that I did not expect. You can see the coffee stirrer patch jobs on the wood, but they blend into a sort of character look with a thinned black base and a dark brown... like the gun has been through a war....
Folks at the range ask me if it is an original, which is a little embarrassing in spite of the fact that it shoots well.
Depending on how well it photographs, I may do a post on it and then run the gauntlet of all the expert comments.
Judging by your photo's, you do good work and the gun may not be as bad looking as you think.
Um Juss Sayn...
fuggedaboudit