The talisman makes sure that the weapon always HITS.
If the A.S. hits, then the damage at range X is the percent chance that you will capture the ship.
IE:
100 damage = 100% (may be limited to 99%) chance of conVersion when you hit.
50 damage = 50% chance
Anything over 100 is the same as 100, so don't bother with a massive-mount
I am pretty sure that the computer virus skips shields.
Be sure to place the subverter AFTER the virus, so you can take the ship in one combat turn.