No offense, OP, but your stance of "not fair" is baseless. Either way is completely and absolutely fair as long as seating is random. It's your tournemant, do what you want. I would just do one table of 11, but not out of fairness, just to keep my workload down as people get eliminated. I believe I would use the sentence, "We're doing 11 because otherwise it'll be a pain in MY ass."
The blinds coming around faster in the 5 handed game gets offset because the 5 handed game gets more hands per blind level.