You know what I meant Karnak. IIRC, I've already stated its impossible to perfectly re-create everything that goes into a ricochet or non-penetration.
And perhaps thats what you can draw from it. Though I simply meant that "because auto flack is modeled weakly, though for cognent reasons, it would pay to keep in mind that the tank modeling might not be buggy, or even misunderstood to any excessive degree, but rather just weakly modeled for cognent reasons".
I don't know what all would go into a realistic auto-flack model. I have trouble seeing it being more complicated than enlarged auto-ack (which is fired from the gun barrel of the 37mm and 20mm's on field, and is stopped by structures and terrain) that explodes at a set distance, or when in proximity to an aircraft, as opposed to on-contact.
Likewise I don't know all that HTC has put into their armor model. The anomolies we see could come from being either highly detailed, or being rather seriously flawed, and as of yet we have been unable to determine which it is.