Like you say, the problem with using indian paving as wall tops is the lack of weight , also the mortar doesn’t key to them like a more course/porous wall tops. Try and use a soft grey or red building sand 2-1 mix. Pva would be no use in the mix. If its a particular problem area eg. Being stood on a lot, knocked all the time and it isn’t a long run? You could resin bond them.
Always a problem is you haven’t got weight, surface area or both. Try bonding some “keying material” to the surface of the coping – EML or some light mesh so that the mortar bed can get its teeth into it.
Also wet the coping (face going onto the mortar) before laying
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