It's normal for the temp gauge to go into the hot after switching off, especially if you have just come back from a run. Heat soak raises the coolant temp in the block which is now not circulating. Actual temp you are seeing is specifically that of the coolant at the back of the head.
The rads maybe different but both the PV and the Amazon list as both being of 8.5l capacity. Some B20.s have a spacer between the fan and the pully. If you have room for one it could put the fan closer to the rad. That would be useful. The asymmetrical 5 blade plastic fan is supposed to be a bit more efficient and also quieter.
Personally I would consider fitting an electric fan in front of the rad. One large one or perhaps 2 smaller ones as it is a tall rad.
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