[Umfuld]

No. That message doesn't mean they have a lock on you. It's a clue that they may, but they may not.
If the pings start coming very fast I will usually go to flank.

I wouldn't stop, even at that depth. I know you are waiting but at a knot and a half you're not going to move very far. But even that little bit should make you a tougher target. Also if you have to go to flank to avoid a drop you'll already be moving and can get to speed faster.