@Kyle Scholnick
I'm late to the game on this thread, I missed it until tonight. I have to say I've learned more about TK over the past hour than I knew total beforehand.
I don't have specific advice on TK for you. But, I am also a physician who got into real estate as passive diversification play. It has evolved into something very different for me. My first year (2013, not long ago) I bought a fourplex that caters to medical students since I knew I could relate to the renter population and a 16 plex in a completely different part of town that I hired a PM company to manage. I had been wanting to get involved in real estate for many years, and that pent-up interest and some initial success led me to expand pretty quickly (4 additional buildings, 134 additional units since that first wave).
I have no specific complaints about my PM company, but I would echo what @Jay Hinrichs has said in that they are potentially a drain on your return. While I don't suspect intentional errors, every so often I have to send an email asking for "clarification" on what happened to the security deposit for x, is that a repeat charge for the new carpet in unit y, etc. These errors would be corrected when I pointed them out, but if I wasn't going over my statements with a fine tooth comb, my CoC returns would certainly be lower.
The point I would take home from this is - nobody will care about your investment return more than you will. Even a great PM will not be as invested in your portfolio as you are. You have shown on this thread that you expect full, accurate information about what goes into these TK investments, and rightfully so. But if you buy a portfolio of 5 (or 10, or 20) TKs are you going to be satisfied trying to evaluate the performance of a PM 4 states away? If you vacancy spikes temporarily are you going to be losing sleep wondering if the marketing, turnovers, etc are being done to your expectations? Passive investing sounds great, and you may find a great TK company, but will you truly be able to be "hands off" if you have a substantial stake at risk? For me, the answer to that question was no as my portfolio grew larger.
I was able to become more active in managing my own portfolio (without cutting back on my clinical time) by hiring a great team. I have a full time maintenance man and an office staff. They are far more affordable than a PM company and phoned in contractors, and I can count on them to manage the properties to my expectations. If there is a problem a quick phone call or face to face meeting takes care of it all. I'm far more comfortable dealing with my own employees than I would be with a TK company that introduces the possibility of conflicting priorities. Something to consider.
Good luck with growing your portfolio!