What coolers did you use?
I wouldn't trust them. Stock pressure can spike to over 200 psi in the lines. he is running over 300 psi with no knock down which means the converter clutches see that pressure. Converter out fluid goes directly to cooler.Cooler lines will see around 125psi with a trans running high line pressure. Those push lock fittings are plenty sufficient. The more that hose expands under pressure, the harder it grabs the fittings.
I wouldn't trust them. Stock pressure can spike to over 200 psi in the lines. he is running over 300 psi with no knock down which means the converter clutches see that pressure. Converter out fluid goes directly to cooler.
Be interesting to see what the pressure is entering the coolers and exiting the second cooler. Bet there is a pressure drop. If so, that means pressure can build up at the first cooler and pop the line. Just a thought.