I have two points to make:
1. In addition to the plastic pipes in the front and under the supercharger, did you also replace the crossover pipe in the back? In my initial attempt, I only addressed the two primary leaks at the front. However, upon further inspection with a scope, I discovered fluid beneath the supercharger and on the gearbox housing. This led me to the realisation that I needed to address the crossover pipe and the one that connects the oil cooler to the underside of the supercharger. Well, would you believe it? Fluid still needed to be added. At last, I located the source of the leak: the little line exiting the thermostat casing. Then, praise the Lord, it will be sealed. By the way, aside from the thermostat housing, pressure testing was never really useful in locating the other leaks. Under pressure, it is difficult to notice them because either the valley beneath the supercharger or the drop pan beneath the vehicle collects the drips.
2. There are several posts regarding this, but a bleeding process can be used to remove air. There are two ways I do it: first, when I have the vacuum bleeder available; second, after the fact; and third, when I don't. Obtaining a pneumatic vacuum bleeder is clearly the optimal method for removing air from the many air pockets found in the block's hoses and water jackets. The steps to do that are rather obvious. Halfway through, loosen the bolts on the reservoir and raise it as high as possible to make it the system's highest point. Turn off the engine and remove water from each bleeder by cracking open each one, including the one on the water bottle. Before starting the engine and bleeding everything again, make sure the coolant container is full. Raise the temperature of the engine and turn up the heat. After a few minutes of running, you should see solid heat emanating from the vents. After that, you should crack the bleeders again. Refill fluid reservoir and reassemble. Keep it on the road for a week, and then fill up the fluids and crack bleeders again. Additional problems may arise if you continue to experience air.