[Closed] Problem with old F100R's

I've recently built a race bike using some old Fox F100L's
And although I've got enough air in them to give me the recomended 15mm of sag for xc use, they pogo so much when I climb hard that they put me right off my pace.
They're not too bad climbing when the forks working off road, but at a race last Friday they were dreadful on the smooth climbs.
The forks are very old 2004, but have been sat unused for about four years.
Any ideas?
All my other forks past and present climb well without lockout.