Oh I'm with the "second opinions" here.
You did one hell of a job last time, and given your knowlege of whatyou body can do, I can't see why you can't attempt a perfect second vaginal delivery.

My SIL's third child was 'estimated' at a "minimum of 10lbs" at about 36 weeks, and he came out at 7lb 8oz or something. They don't know.....................

If you're not happy, get another opinion. Good luck with it.