I just reached 300 skill in Make Poison, and already had maxxed out AAs for both Poison Mastery and Salvage. I also have both the Grandmasters Assassin's Vial and the Grandmaster Assassin's Seal and equipping either of those gets my skill up to the current maximum of 315. Is there anything else I can do to improve my chances of success or item recovery on a failure when doing OOW augment combines? I don't think there is, but given the value of things like slugworms, radiant cut stones and inlays I want to make sure I haven't overlooked anything.

Also, what is a fair price to charge for doing augment combines for other folks?

Thanks.

Always make sure you're doing combines with a shaman's Wunshi buff up.

I thought that only affected skillup rates, not success with combines.

Am I wrong about that?

It really depends on the situation IMHO. If I can trade a couple JC combines for a PM combine, giving 2 people a chance at a nice aug, it is a fair trade AFAIC. I happen to be the type that doesn't charge anyone that I "know" because I may need a favor someday from them. A total stranger would be another story, and I wouldn't feel bad about taking a couple Kpp for doing it, but I allow them to barter the price, not me.

You are correct. Stats effect chance to skill up only. Skill level is what effects chance to succeed. At 300 skill and GMAS your doing the best you can.