So for my situation:
(a) Brand new Sunlite 22 cog rear free wheel (for single speed application).
(b) Brand new SRAM PC-1 SS/FG chain.
(c) From chain ring seems okay, but it is old. Going to replace that to see if it help.
(d) The chain line appears to be correct and aligned.

Bike: Raleigh Technium 460 (50cm) - Aluminum main frame, with rear triangle comprised of steel seat & chain stays.

The Singulator is set to exert downward facing tension on the chain, and when climbing even mild grades or exerting moderate force on the crank the chain appears to tighten up, and pushing the Singulator up towards the chain stay, until the pressure then is relieved somehow, and the Singulator snaps back into position.

Curious why, if the chain were slipping, it would cause this tension to push the Singulator up.