I cannot offer anything on whether this or that produces a harder hit regarding no veneers, or dyed veneers, or hardwood veneers...but I can offer this, and I think it might have been mentioned before in a previous thread by someone else as well.
I know that veneers are often "dyed sycamore". If the sycamore that is used for the veneers is English sycamore, that tree is not what is called Sycamore in America. English Sycamore is a maple. It is not as hard as rock maple, but it is harder than red maple. In fact, the species of this "Sycamore Maple" is Acer pseudoplatanus. Platanus is the genus for American Sycamore. The maple in question was called Sycamore because of the leaves being a very close match, but when it was realized it was a maple, it was named Acer pseudoplatanus, meaning literaly maple that is a fake sycamore.
If indeed the dyed "Sycamore" veneers are this species, than they are not much softer than hard maple itself, and harder than red maple (which is used often in cues I believe). A red stained maple veneer would certainly not compare to a bloodwood veneer, or black stained to ebony veneer, but it certainly isn't a softwood.
for what it is worth if anything...
Kelly