In this case man. From your pictures it looks more like your motor dropped a valve. Did the tuner cause that by adjusting cam gears maybe maybe not. But you built the engine why didn't you clay it and communicate the tolerances to the guy tuning the engine. From what you said it sounded to me like he was working his ass off to give you the best results he could.
Then he would have know how far he could or couldn't go. NO TUNER WANTS TO BLOW AN ENGINE NO TUNER BLOWS AN ENGINE ON PURPOSE.
As a tuner blowing up someones motor hurts business and hurts your good name wich really is all you have to keep people coming back to you.
Rebuild your engine get it tuned again make sure to be more throrough next time.