My views on objective morality

[Neo-Scholastic]

...tit for tat will prevail in a group over time compared to other strategies such as always defecting.  This is an objective fact and it likely constrains what strategies can be considered good or efficacious and which are considered bad.

I'm not so sure. Tit-for-tat loses its efficacy when there is an imbalance of power between players and that is when ethical constraints seem most critical. Second, effective is not synonymous with moral, so additional steps are needed to make that connection.

...one could hypothesize that the ideal of these naturalistic moral facts is The Good, and is something that we all strive for.

I favor virtue ethics over deontological approaches. In theory, someone could have a non-theistic version of natural law but to my mind it would not be substantially different from a theistic version.