I wonder how fast the lines usually move? I'm getting Welling Hoechlin for sure, but I'd also like to be able to walk around and look at the vendors. Not sure I'll have time for all the guests I'd like to get autos from.
My advice is get there as early as possible and get in line for who you want to meet ASAP. The lines are always shortest in the morning.
The other, more involved, approach is to look at the schedule for photo ops and panels to see when they definetly won't be at their table, then try and get in before they get back.