In my expirience which I dont have much of Bucking seems to be related to having too much fuel. Usually this is caused by your MAS missing counts or not being able to meter the air at all (from an intake leak somewhere after the MAS itself). Are you sure it is a buck or a miss? If it is missing it could be several things. I wanna say not enuff fuel since when you turn up the boost it gets worse but your setup should be fine @ 15psi or even 18 psi. It could be ignition too. I would try testing all your ignition components as per a shop manual and make sure they are in spec and check you fuel system. have you replaced your fuel filter recently?

hope some of this helps.

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Joe
94TSiAWD
http://www.cr-racing.com/talonpage.htm
13.001 @ 106.55