Gnads,
I used the 4.03, "Landing distance without autobrakes" runway condition covered with 12.7mm(1/2inch) water, corrected for tailwind and 4 operative reversers from that same page for the unfactored. And the landing with "autoland landing distance with autobrake", runway condition 12.7mm(1/2inch) water, corrected for tailwind and reversers from that same page for the factored. No extra multiples by me.
For a non-normal I would use the 4.03 distance multiplied by the "LDG CONF/APP SPD/LDG DIST FOLLOWING FAILURES" corrections as required. Depends what type of HYD failure you get mate. Could be upto a multiple of 2.4.
Anything else I can help with?
Don