Well, that's a rather tight schedule, not extreme like back to back breeding, but tight anyway. I prefer to not wean the kits prior 8 weeks and let her recover, you'll have to remove them at about somewhat less than 5,5 weeks, a few days before the doe kindles.
Don't get me wrong, I guess many commercial breeders have tighter schedules, so it works for them, and I'm sure many learned through trial and error, and now know what they are doing.
There aren't many kits in the current litter, right? That would make it less stressful for the doe.