Im mobile, I dont have numbers in front of me, but Tiger has 43% chance to penetrate, IS has 65%. Thats the key.
No, that's not they key, TA is losing less of it's performance at range than the IS-2.
As shown here:
IS-2:
Long range chance to penetrate TA: 63%
Point blank chance to penetrate TA: 83%
It's 25% (% not % points) less effective at long range than up close.
TA:
Long range chance to penetrate IS-2: 48%
Short range chance to penetrate IS-2: 59%
It's about 19% (again, % not % points) less effective at long range than up close.
Anyway, the point is - your video about the TA vs vet3 IS-2 doesn't really show anything else than the fact that RNG is a big part of this game, with TA losing against IS-2 at range where it has the biggest advantage, while winning at other ranges where it's advantage isn't as great.
But again, just because TA has an advantage at all ranges (and biggest one at max range) it doesn't mean it will always win. Except at close range rear armour fight - here it will win all the time (because there's no RNG involved).