Until we get more stick time with the new Wii amp, this data along with the prior posts re-confirms that your best RC configuration is using the Dragon amp on the TX/RX-Combo port, and the 8W amp on the RX-only port.
I have procured 3 of the "8W" amps and all of them perform exactly the same. There have been a couple reports of an 8W that far outperforms what I have reported. Until I can get one of these in my hands for testing, I have no evidence to back these claims. PM me if you would like to send me your unit for testing/validation.