Zero-Crossing AC SSR not working for LED lightbulb
Snubbers are generally  capacitors in series with a resistor ( which absorbes the transient energy) You could try a 240V ac  X rated 0.47uF capacitor  in series witha 47  ohm 1/2 watt resistor across the LED  just to see if that makes a difference. Remeber PF is is defined not only a function of  displacement  between voltage and current ( as per an inductive  or capacitive loads ) but also of harmonic origin, as per non linear devices. For the LED the distortion may  occur around the zero crossing point of the AC waveform due to the LEDs  V/I characteristic below a few volts - thinking  maybe that is  the reason for that type of zero crossing SSR not triggering reliably ? The capacitor / resistor combination will provide an element of inphase current / voltage which will help trigger the SSR reliably.