A update. If anyone is still reading my dribble lol.
I have been experimenting, a lot, with length, weight, and balance. Seems that small variations make pretty big differences, relatively speaking. I think I have been barking up the wrong tree (as mentioned already).
A similar match to purple heart in density, grain, and hardness is black locust. Messing with the dimensions I can get black locust and purple heart to play close enough for me. I am sure there are others that will fit the bill. As I keep saying. I am going to keep trying everything I can get my hands on, cause I like to, but I think I have found what I set out for.
I believe I am going to resolve to the use of exotics. At very least for striker dowels. There are too many fun choices to leave them out.