I've had no trouble with the screw-on freewheel version, in 25 years..

have you flushed out any heavy grease from the ratchet/pawl mech?,
sometimes the grease has filled in the space the pawl engages.
light oil, phil wood tenacious, at most..

It's what I lube my sturmey 3 speed, and screw on freewheels, with..