And 4 piats almost solo knocked out a Elephant which couldn't even escape to his mobility and PIATs range
I am not convinced that the title of the replay actually corresponds with the content of the replay.
4 PIATs already vaporise Elefants in the live version. It takes 18 hits, regardless of penetration or not to kill any heavy tank due to the insane deflection damage. Thus, that Elefant would have vapourized way earlier with live version PIATs than the PIATs you tried.
4 PIATs can deal up to 400 damage, if all of them penetrate. The reason why Hector's Elefant evaporated so quickly is because it was facing its rear on the PIATs; bad move.
Live version PIAT range: 45
WBP PIAT range: 30
Now that's what the theory says.
Practice says I did some significant messing with damage values to fix veterancy issues. I did a recheck, and I couldn't find anything that indicates a bug. However, do keep your eyes open, because there might be one.