(Edit, so Neal got in first, but mine is the more complete answer

)
daemonkin, from what I read you did not quite follow the correct process as you allowed ground AA to engage the THawk after it had moved but before the TBolts on CAP moved.
What should have happened is that the THawk moves, followed by the TBolts on CAP. At that point you follow a LIFO process (Last In First Out).
1) Ground and air AA shoot at the TBolts before they complete their CAP mission,
2) Ground and air AA shoot at the THawk before it completes its Ground Attack mission.
What Mephiston was trying to suggest revolves around where you positioned the TBolts relative to the THawk, because its defensive AA is a single 15cm AA5+ shot everywhere except the Fixed Forward arc at the front of the unit. As the TBolts have some 30cm weapons, they could have stayed in the rear of the THawk outside the defensive AA bubble and still had 4x AA5+ shots (which become AA4+ with the 2008 errata).