GW1.1: Large Tanker weakest spot, best hit location ?

[Shahed]

Salute !

I've tried engine room mostly and it's random. Sometimes it does kill it, but mostly immobilises. The 1-2 metres between engine room and fuel bunker are usually a critical hit but that space is hard to hit, unless in ambush. I've killed one from 3.5 kms with a 9m depth/impact T1 to the keel, but that also does not always guarantee a kill.

If using 2 fish in the first attack, simultaneous salvo:
engine room + fuel bunker = destroyed (high probability)
engine room + center tower = destroyed (high probability)
engine room + forward bow = sunk (very high probability)
engine room + forward half = sunk (100%)

3 fish salvo in any combimnation of above = destroyed (99% probability)

I''m trying to find the weakest spot which will most of the time, guarantee a kill with one torp. Not sure but I think this is a ship which in the majority of cases may not go down with one torp, but rather with two, sometimes even 3 (!!!).

This is a high value target in my play style hence I'm trying to find out the best way to kill it.
Anyone know what is the best location to kill the Large Tanker with one torp, GW1.1 ?

Thanks in advance !