Also take into account how little SpS contributes on a per point basis. If you're going to gear for it you have to go all out to get the most from it. It's similar to Haste in FFXI where if you had a piece of gear with 2% Haste it wouldn't really do much (or anything) on its own and you'd benefit from more damage. If you got to the cap of ~25% however you would notice monumental changes. Same deal applies here. Stack it or ignore it, unless secondarying it can give you a noticeable reduction that is. Likely be the superior stat in the game's future when more is available.