I find no correlation between the surface I am printing on with jams.

Nozzle blockages occur (for me) for the following reasons.

1. Not printing hot enough for that filament
2. Printing too close to the print bed, stops the filament coming out - (a constant issue on my kossell due to the frame of the machine changing shape with weather and throwing my Z calibration out every now and then )
3. Clogged nozzles from foreign debris from cheap plastic, manual cleaning required.
4. The feeder gear is full of plastic shredded dust and is not gripping the filament well. A hobby knife can clean that out pretty easily.

In the case of #4, it will present the same clicking sound, but instead of it being a blockage, its more a bad feeding mechanism.