Uhm no sorry but a sinlge lvl of FvS doesn't work as you hope, you won't get double SP from items, you'll just get a bonus proportionate to the lvls you have in FvS not a blanket +100%...

What's the problem with cleric and toughness?

IMHO a better class split would be 17C/2R/1Monk if you have it or just a plain basic 18/2 or even a 17/3 rogue if you really want that 3rd rogue lvl as giving up 18th as cleric doesn't hurt you *too* much.