Typing on my phone so no hyperlink regrettably. 

The values he used up/down almost mirrored my last market (central CT), so I simply used what I "knew".As far as a patio, if my house didn't have one, but a comparable house had a 200 SF one, then I would adjust by 200 SF x $10/SF or $2000.

Whoever did the BPO on that property needs to take a good look in the mirror.

My personal residence was owned by an investment group out of Texas and they did not advertise on the mls they simply listed the property on their site and it was mirrored on zillow.

I think your point, however, is well stated to all of the other folks on BP who will read this thread - choice of sponsor is critical, but so is looking in the mirror (no, not you Ben, you look in the mirror enough!).

I thought brokerage firms would accept anyone who can fog a mirror but I guess I'm wrong.  

If you don't need to get all of your equity out of the house I would get 20 - 30% down and then finance the balance from your purchase price at whatever terms to mirror yours loan with at least 2% on top of that.

Smoke and mirrors won't make this look any better.

John Mireles your thinking mirrors my own.

If you really want to "fix" the problem at low costs, you could put a mirror ( big one) in each room.