It sounds as though you are the first vehicle at the light....I had similar "incedents" as well.
Now when coming up to a stop where I will turn right, I stay to the left half of the lane coming to a stop, but when I stop I place the bike at an angle to take up more of the lane. I can still roll forward to see if I can make right on red, and it also puts me in a position to get out of the way without going straight into the intersection, if someone is bearing down on me from behind.
