i was confused and Im sorry to have read it wrong. stock your dyno is about right on where it should be, i think the dyno reads a tad high but hey its a dyno they are all off by a bit its really only to get you with in 10-15hp~ there about (on a good set up dyno) and for basline vs mod runs to see the percent gain not a EXACT measure of what you really have at the wheels, close but not perfect.
I find it VERY hard to belive you got 12 rwhp from a mail order POS chip.. just imagine if you really did what you could get with a REAL chip and dyno tune... it would blow the mail order chip out of the water.
your TB and MAF probably are hurting yoru hp and tq... i have yet to see a dyno that someone gained more than a hp or two, tb's have even robbed cars of power so if you can make sure you are getting gains from these mods, the maf might be helping you and the tb robbing some of it, there is NO need for a larger than stock TB on a stock car.
is yours an auto? it would explain the 16's you run but stock times are about the same. get some practice and you should do quite a bit better at least 15.9s