While frothing isn't good for any llubrication system, I doubt that it is that much overly full to lose any sleep.Did my final drive before I had a manual, filled it to the bottom of the fill plug while the bike was level. No ill effects yet, I could drain, but it's probably just frothing a bit. Not sure I need to pull the plug?
I had the same thing happen to me, couple drips, wiped clean, bone dry after a week. Re-used the crush washer. I just rotated it differently so it would crush different. I really think that bit of extra just accumulates and you can see it when you tighten the plug. Not sure it's actually leaking. I even had a couple drips on the ground, but it's been dry since.I'll add that if you do change the final drive oil you prob want to replace the crush washer as I failed to do that and it has a very small seeping that would accumulate around the drain plug which took a few weeks to go away.. will definitely replace on the next go around.