When I filled my system for the first time, it took almost three hours before Iplugged the top of the fill line. Lots of air to move out and my "T" was in the wrong position in the system.
When I moved the "T" to the location as shown in the image I posted above ("T" is located up high) it only took about 20 minutes to re-fill and bleed before I capped it off. We must take into account that I drained only the water block and the lines, the radiator was NOT drained.
In your case I honestly don't know why it worked better in the second setup unless of course the radiator was not drained.
It would help to see all the components and all the hose connections. It looks like you are pumping up to the "T" and then feeding off the side of the "T" to either the water block or radiator, I am not sure?
JIm
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