With 1500ppm loss on both PR2 and PR3, 150ppm arm cavity loss:
We get a PRC gain for the CARRIER (non-flipped folding) of 21, and PRC gain (flipped folding) of 20. This is a 4.7% loss of carrier buildup.
We get a PRC gain for the SIDEBANDS (non-flipped folding) of 69, and PRC gain (flipped folding) of 62. This is an 8.8% loss of sideband buildup.
With a PR2 loss of 896ppm (from the plot on the wiki), but no loss from PR3 because we didn't flip it, and the same 150ppm round trip arm cavity loss, I get:
Carrier gain = 21.0
Sideband gain = 66.7
(No loss case, with an extra sig-fig, so you can see that the numbers are different: Carrier = 21.4, Sideband = 68.8 .)
So, this is 1.6% loss of carrier buildup and 3.1% loss of sideband buildup. Moral of the story - G&H's measured AR reflectivity is less than Rana's guess, and we didn't flip PR3, so we should have even less of a power recycling gain effect than previously calculated.