I did the same thing last year, about the same timing too. I was putting the 'runts' outside and they took off. I don't think it's too late, from my experience, but I wouldn't expect too much either. Worth it to let em go so you can have an idea for improvements next year. I got about 3 zips each from a Satori (had to take her early) and a few KC Brains Mango.

Good luck with it !