I got feedback from the guy that cleaned it out - he said it wasn't as bad as he expected, but there was definitely some sludge in there. Where did it come from? Oil from the turbos (expected), mixed with water from condensation. It created a sludge like oily mixture that could have been getting ingested into the throttle body since the intercooler is the last stop before that. The water from condensation is expected since there's bound to be small amounts of water in the air the car is taking in (natural humidity) and since it's "charge air cooler", it's bound to cause some condensation. Water + oil + time = sludge.
Since I've had it cleaned, I've had ZERO symptoms of odd seemingly-powertrain-related behavior. I even took it on a trip with the family to Cedar Point in Sandusky, OH; and it performed perfectly the entire time. I'll post again if something changes, but for now, seems like the Ford Tech was right. Sludge = weird throttle body related behavior. Cant' say I'm surprised - it makes sense. After all, when I inhale something my airway wasn't designed for, I cough too!!