Where those the same plugs you ran on the dyno? Or did you regap those since then and or replace? Those look ummm well used  I would see if you can't get a OBDII scanner on your car on the dyno. From there we can pull some information. Thus we can see what we need to drop or raise in Fuel Pressure, Timing, Spark Curve, ect... That would help out alot!!!
Merlin
281hp 324tq
Timing 14' FP 36,24lbs,190lph,75Maf,65tb,cobra upper&lower,B303, GT-40 Crate with X al heads, Mac shorties, Off Road H,2chamber Flow's dumped, Tokico 5wys, Hotichkis Ctrl Arms, Alum Drive shaft, 3.73, Sub Frame,Steeda Tri-Ax, 94 Seats Drivers side powered.
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