anyone being induced start evening primrose oil early?

I'm being induced at 37.5 for GD. So since I will be induced due to large baby, I want to make my body more ready for induction to prevent needing a Csection if possible. EPO just helps soften the cervix so I began with 1 at 32 weeks (this week) and was wondering when I should increase? It doesn't start labor. I may insert vaginally between 35-36 weeks but I'm undecided. Any advice or experience?