Thanks for the update, Andy, I didn't know the fuse technology had changed so much over time.
Considering this, most old HEAT warheads (say, up to and including the PG7VM) should go off at a whim, even (case considered here) when hitting the canvas top of a soft-skin vehicle. And I guess this should also be the case for most first-generation ATGMs (AT-3, SS-11, Cobra, Vigilant...) which have equivalent technology and similar velocities (not above 1000 ft/s).
Now we agree about the way RPG fences used to work, by trapping the fuse tip between the wire and in some cases crushing the conductive warhead cover. My point was that with a high enough velocity and an insensitive enough fuse, a vehicle canvas (or even bonnet) could act the same way if the fuse tip managed to rip through without detonating.
If you want some more RPG references of the olden days, I've found
this TRADOC manual from 1976, building on Vietnam and Israeli experience, with info on RPG fences, weathercocking and riding the wind, and of course those damn aiming procedures.
Probably not worth the Jane's data, but worth a look for everyone.