I totally understand your concerns about certain things.
Many have given great commentary.
I am not sure how far away this facility is from you, but I stumbled upon it one day when I was searching around on the net for rescue horses.
This place is really on the up and up and tells it like it is!
Check it out and if they are to far away then they may be able to direct you to a place that is closer to you! www.rerun.org
I just loved all the information they gave about the horses. Whe I saw that they were telling people about the specific issues some of the horses had I thought "Wow...that is so cool they hide nothing"
Anyhow. I hope the link helps.
I think OTTB's are great. Yes some come with all kinds of funky quirks, but you may want to ask for a trial if you find one you just fall in love with.
Even tho my two were unraced, they have there little quirks but nothing that is insane and off the chart.
I think with dedication and work you will find what it is your looking for...