My son was just upgraded to 15/5 today. Just had a chance to test it, and it showed 25.5/4.9. My 20/5, in the same CO, always tests 4.5 to 4.6 on the up side, so his 5 up is better than mine ever was.
We're all BPON, built out in 05 - 06. I'm wondering if your level of "fluff" has anything to do with whether you're B or G PON.