To make the answer simple.

No Damage. Since none is present now and you caught the mistake.

I also think the up to .5 qt's over probably would not hurt in any event (I've run .25qts over since new - 14k miles) Especially at high rpm's like mentioned because the pump is pushing so much oil it's never pooling in the pan.

2000 SVT #674 - Check it out!

Whoever coined the phrase; "If it ain't broke; don't fix it" ~ Just doesn't get it...