The optimal strategy seems to be Prudent Extorter:
Extort agents vulnerable to extortion
Cooperate with agents that are not vulnerable to extortions and will cooperate back.
Defect against everyone else.
Such agents perform better than your Naive Extorter as they would be able to cooperate with each other and do not nuke a Defection Rock.
When Naive Extorter meets Prudent Extorter they die in a nuclear fire.
The optimal strategy seems to be Prudent Extorter:
Extort agents vulnerable to extortion
Cooperate with agents that are not vulnerable to extortions and will cooperate back.
Defect against everyone else.
Such agents perform better than your Naive Extorter as they would be able to cooperate with each other and do not nuke a Defection Rock.
When Naive Extorter meets Prudent Extorter they die in a nuclear fire.