I haven't flown in there personally to see the PAPI issue, but I'm interested to know at what point does the PAPI become useless? ie..
-Is the problem the same for the RNAV-Z and RNAV-Y procedure? (one is offset, the other isn't)
-If you are on the published 3 degree CDA profile per the approach plate do you have an on-slope indication all the way to TCH? If not, when does it start diverging? Are you on-slope at MDA?
Cheers
PPP