This is odd. I've got a beam PD destroyer, and for some reason it's shooting down precursor missiles without tracking speed being taken into account. With a tracking speed of 16000 and missiles at 40,000 km/s, it should only be hitting a bit over a third of the time, but the event log is listing its hit chance as 97%. I don't know if the actual hit chance is that high, since I haven't seen more than one missile at a time get through my countermissiles yet.
Edit: No, wait, it does, it's just only shown in the target hit and target missed events, which I turned off to cut down on message spam. Maybe the effects of fire control tracking speed should be shown in the Targeting event, even though weapon tracking speed might be lower.