I am 100% sure scents/taste can make a difference. However I make my own. I am sorry I can not give a recipe as I may go commercial on this. It is however a combination of many different substances and I have worked with different smelly baits for years so I have access to a lot of weird stuff.
This I have posted earlier, there is a sauce on the soft bait to the left and later in the video on the hard bait to the right:
Here there is two identical soft baits, sauce on the right. It seems like it works especially well for the more sceptical fishes.