I often have transplant issues, I'm working on getting better at that I know the problem but it's more of a space issue then anything for me plants often stay in small pots longer than they should. But that being said, I will let them go a bit longer in veg and cut them back if they get too big. I think it's better to send em in healthy or close to it even if have to wait and veg a bit longer, I have vegg d plants fairly large and cut them way back down to flower them with no problems. Don't b afraid to use scissors, they grow back lol. I cut my mom's from 3 ft tall back down to 1 ft tall on the regular and never lost one or anything. Of course in a perfect world everything would be timed just right but I rarely time things right as there are so many variables to that.