How much fuel do you have thru the engine? As you get to about a gallon the engine will really free up and you will have more overall power.

Does your engine idle really well? Does it load up with fuel if you sit still for 5 seconds? If the idle seems good and it does not take a while to clear out when you first leave from a dead stop of 5 seconds then your LSN is pretty good. Being that your temps are only 190, you can lean the HSN a little more. Even though it's the HSN if it's rich your engine will feel flat from the bottom all the way to the top.

Like rokit said, try the 198 header as I think it's always good to have both headers around anyway. A #5 plug might make the bottom end feel slightly more crisp but it will probably not give you more bottom end.

I would also try to change the clutch slightly, maybe 2 .9's and 2 1.0's with that clutch.