If Im waved by I still try to cross the line before passing
HOWEVER
Please read this, I have been on a couple group rides and as the group has passed slower vehicles the bike in front of me would clear the vehicle being passed then let up and even touch the brakes, Here I am keeping up with the pack, going around the slower vehicle and getting back into my lane only to see the bike in front of me slowing and had to make the decision to either brake and take a chance of the bike behind me having the same problem or passing the slowing bike, Both times at least the bike did move over to the right so I was able to pass on the left but in the same lane. Little scary.
When passing in a group, Please dont let up after you have passed the slower vehicle, There are bikes behing you still accelerating.