Hi Eskimo,
Congrats for developing a chess program, that's an achievement!
The Mirage module features level 8 where you can set the time per move you want (mm:ss).
From the CB-Emu package, I would suggest these relevant opponents :
Fidelity Sensory 9-b (2Mhz) 1630
Novag Constellation (2Mhz) 1699
Saitek Maestro A (4Mhz) 1722
As you tell us Sigmund looks to have reached some maturity - maybe time to share it?

I have a collection of chess programs and would be happy to include Sigmund in some tournament games to come. I don't mind using a DOS-like interface. But feel free, if you want to keep it private, it is perfectly fine, of course.
Best regards,
Tibono