IT/FS build is
ob x2/bs x2 (75rp)
then you FS x2 (11rp)
then itx3 (86rp)
fs x2 (22rp)
it x3 (97rp)
fs x3 (1rp)
ends with...
ob x2
bs x2
it x7
fs x7
in 20 seconds, of course you use unholy presence to get more GCDs
edit ok that should be fixed, also this is starting from nothing, not assuming full death to start
edit2 if i just count it/fs at 2300/2900 = 16000+20000 = 36k