OK, don't think I gto it wrong about what WAS slat armor!
I still don't see why an ATGM would have a better effect against it. A LOS-flying classical ATGM like any TOW or HOT or Konkurs or anything is contact-detonated, so in many cases the fuse has as many chances to get caught in the cage and not detonate as with a RPG rocket.
As I told you, I don't think weight will matter that much since the velocity of the thing is fixed and generally subsonic, better as fast as most AT rockets. Though the cage looks frail, it is built to withstand the sheer kinetic blow, as well as small arms fire, collisions, road vibrations and so on. I don't think the weight of an ATGM will make such a difference.
Maybe if you are talking Shturm, Krizantema or Maverick, but in many cases I bet the missile will either detonate prematuredly, get crushed out of order by the grid or even bounce off and THEN detonate. Don't forget the incidence angle!
Anyway in the cases where the warhead does detonate on the cage, a bigger shaped-charge will have more penetration and be less affected by the standoff. This is where you have to calculate how much steel it is worth!
Any data about this, lest you force me to dig out my thermodynamics printouts and bring back painful memories from the times I did study something?
On the other side, I must agree about thank rounds
. That is where you have kinetic energy!