Inducing @ 39 weeks because of "high" amnio fluid levels?

My doctor suggested inducing because of "high" amnio fluid level (10cm) so that they could have a better control of my baby's position (he keeps on flipping because of all the space still available). 
Is this a legitimate enough reason? I don't have diabetes, no other problems besides this - no swelling, no back pain, 22lb weight gain.
This is my 2nd pregnancy and the first was no problems - vaginal, quick and easy.
Induce or wait? Doc is leaving the decision up to me.