Hmm, just check two generally reliable sources fro the RPG-29,
Rosoboroneksport and
Worldguns.rugive "over 600mm behind ERA", and
Waffen der Welt gives 750mm without specifying ERA or not. I expect Rosoboroneksport to be somewhat optimistic on the system, since they're the ones selling it.
I can't reach Vasili Fofanov's page on the T-90 trials right now, if you have other sources on these trials do share, it's never superfluous.
As for KE missiles, I don't know the official opinion of the design team on this, but as far as I have tested, they can use AP ratings rather than HEAT.
Actually I've used much more KE guided weapons in my Cold War mod than are currently being used IRL, where it isn't much of a problem anymore these days.
For those interested, it is possible to give KE missiles a basic AP penetration instead of HEAT. These missiles will behave accordingly against armor (i.e. against steel armor as opposed to HEAT armor), the penetration will not draw down with distance, and they will be much less vulnerable to ERA than HEAT missiles. I haven't encountered any bugs with this, so I also applied it to EFP-based top-attack missiles, on the assumption that EFP kinetics are closer from AP than HEAT warheads.
But as I said, there aren't any guided KE weapons nearing service anywhere in the real world, so this isn't exactly a problem.