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also they are not cheap to make and the maximum success rate is capped at 70 something %
I hadn't heard that. Is that the final few steps of the alchemy/poison combines or overall including all steps? I'm pretty sure my jewelcraft combines for augs is around 85% (just a guess from experience) with JC at 295 and no AAs (well, one in salvage). I think the trivial on the poison/alchemy combines is actually lower than the trivial on the JC combine.
I have a rogue with poison making at around 285ish so haven't attempted any of those combines yet (or smithing the inlays for that matter), but I would like to eventually and a max success rate of 70ish % will definitely affect how soon I'm willing to attempt a combine.