Well I have been hearing that 7.0 has bugs, and this could be another one.
The group pick-up is a workable solution.
If you absolutely have to have it the other way, you may be SOL.
The first version of 4.0 had bugs, the first version of 5.0 had T-1/PRI bugs, and you expect perfection on 7.0? Perfection comes after the second maintenance release but then you are almost ready for the next release.
Good luck, but I think you did everything right and the pick-up works, so at this moment you just need to find additional bugs and work around them.
We've had grafitti vandals spray this building down the street repeatedly at night and I cover it with grey paint (no gang has grey for a color) because I don't want it to spread to my building.
Tonight I got the bright idea of leaving piles of dog poo where they stand to spray. Now that will be their bug in the spray can release.
Cheers, Bunnie