VBAC with GD

So my first was a big baby (99%) thus a csection. This time around, the Gestational Diabetes was caught and much as baby at 28 weeks so am regulating it with food. What are my chances of baby not growing too big and thus me having a VBAC? AT 24 weeks, baby was already 95% but that was before i was diagnosised. Cant i still control growth so as not to end up with a csection? Am small, am worried i might still fail to push even if baby is like 80%-tile

Should i just settle for a scheduled csection?