Am I a good candidate for a chin soft tissue reduction?

Yes, it is quite possible to remove the excess tissues from the chin and under the chin. However, it is hard to assess the flaw with your finger touching the chin. You may want to e-mail of post front and profile views of your chin while in repose and while smiling (4 pictures) for a better advice.

Hello dear
Thanks for the question and provided information as well. 
My recommendation for you is a personal consultation with a certified plastic surgeon to be able to make a complete evaluation and suggest the procedures that can fulfill your expectations and provide you with the best results.
Good luck :)

A hyperdynamic chin protrusion is usually a function of too much soft tissue. But to get the soft tissue adequately reduced some slight bone reduction is also helpful. This can be done through a submental chin reduction approach.