I'm with Roc and Lyu about the base color possibly needing a separate besprinkler. It's the only color that you can't really work with at all because there are no genes for it, so it will always just kind of sit there in the middle no matter how much you try to cover it or make it look better. Having 4 colors to worry about instead of 3, it's incredibly hard to get colors that work well together. And there are no genes that change the look of certain colors to help with this either.
I will say though, I don't think that the color wheel being larger is a very good argument for it being harder to get matchy wolves, because percentage-wise it's still relatively the same. For example, if 10% of the color wheel has purple colors, and 10% has green, it doesn't really matter if there are 200 colors or 20, because the chance of getting a shade of green would still be 10%. All it does is make it harder to get doubles, triples or quadruples, but it doesn't necessarily make it harder to get colors that work well together.
And I don't think there should be a separate one for every color of the wolf either, even with the large color wheel. Mainly because I feel there's something nice about the rarity of getting a cool color combo through luck, rather than just continuously sprinkling one specific color over and over again until you get a double or something. Which, yes, is also still based on luck, but it's not quite the same as there is no risk to it. If you get a nice color combination on a certain wolf, but one or two colors aren't exactly what you were going for, you will have to decide yourself whether or not you keep it, because there's the risk that the next set of colors could be worse. Whereas, with a color specific besprinkler, there is no risk at all. The only think you might risk is losing all your money, but you know you will eventually get the color you want.
I was going to suggest having 2 color besprinklers instead. A besprinkler that would randomize two colors of your choice instead of all four (or three, if base gets it’s own one). It would help a bit with the struggle that is trying to match 4 colors right now, while still having a touch of randomness to it, but it might become a little too confusing.