Yorcia skirmish is a pushover for tier 1 and 2. 3+ you typically want mages or other good AoE damage. All you need to be efficient in T1/2 is a lv 113 wep from plasm/delve. Or if you can find a willing group, get the NQ weapon from cirdas/rala, and upgrade it asap when you get the ki from yorcia skirmish wins.. I find its quite common, 30-40%.

As for the +1 gears, just get the ones that augment specific JAs. Other things like WS/TP are ilvl>all in almost all situations. I just finished all my +1s for 20 jobs... of course now its not much of an accomplishment since most aren't worth using anymore. Although, SE has mentioned AF upgrades.. so maybe we will be seeing an AF4 that comprises all af to date? who knows, only speculation as of now. Long point short, just get the ones that allow to you obtain yorcia gear faster, because that's your no.1 priority after getting an ilvl 113 weapon.