Part of me wants to advise you to err on the side of caution and not choose induction until 40 weeks particularly because you've not been induced before. That said, I can completely understand your reasoning for it - having both complicated pregnancy AND fast labour experience; in the end it is entirely your choice to go with whats comfortable for you.

My first two babies were induced early (pre 38 weeks) due to medical complications and neither labour was over 3 hours. My third baby was a spontaneous natural labour after a normal pregnancy at 40wks and he came in 2 hours, if I had of stayed at home like I wanted instead of letting DH drag me to the birth centre he would have been a bathroom baby

With this pregnancy Im facing growth issues and GD, so even though my OB is happy to wing it and make decisions about delivering when we need too I am seriously considering booking an induction at 39wks for emotional reasons as well as the presenting issues. I am feeling very out of control with this pregnancy and the mental strain parenting three other children and dealing with the complications is draining me. Ive been induced twice before with perfectly positive outcomes so its a little less 'up in the air' for me.

Good luck with your decision!