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You should target a higher Zdiff, 90 ohm +/- 10%. For top layer traces you should have continuous GND under the traces, do not cross any gaps in GND plane. Consider tuning your R-C components empirically using a USB 2.0 eye diagram test setup, and consider tuning using L-C instead of R-C to...
I too have been quite curious about these and glad to see that there is at least a single post on this forum regarding the greenPAK devices (This thread literally the only result for the search term).
These seem to be in a different class than any other logic/mixed signal device due to their...
2nd harmonic is 480MHz, USB 2.0 is NRZ and strongest harmonic content will be at 3rd harmonic @ 720MHz
USB chokes will have significant effect on signal integrity in 480mbit (Hi-speed) mode, if you are dealing with a weak (slow edge rate) transceiver you may encounter significant signal...
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