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The trigger pushes the trigger stirrup. The stirrup pushes against the disconnector, which presses against the sear when the grip safety is depressed.
The left finger of the leaf spring applies pressure so the grip safety works. Too much pressure is almost never an issue...unless it tweaks the other two fingers out of position.
The middle finger is the sear pressure. All it needs is for the tip of the finger to ride (without catching) the ramp of the sear.
The right finger is the disconnect pressure...same as the middle finger...it's got to slide nicely. That's why if the grip drops the tips of the fingers might catch on the ramps of the sear and disconnect.
If those are interfacing nicely that's good. Then check that they're getting 1) pushed properly by the trigger bar...2) moving freely
1) the trigger stirup might be bent and not giving a full push (but then it's likely that it wouldn't shoot on the second pull either)
2) for whatever reason it sounds like the disconnect is sticking. The tip of the disconnect sticks up from the lower frame on the right side. Is it gritty/sticky/over greased? Maybe the first pull is freeing it up to get into position and then the next pull is tripping the shot.
**Edit**
Rack the slide. Tap the grip safety a couple of times (i.e. little slaps). Grip normally and pull trigger. If it shoots, your disconnect is probably sticking....why is a different issue.
I'd pull the mid frame apart, clean each piece, lightly oil (silicone) and test again.
A spacer (1 bb?) in the mainspring will put wear and tear on the knocker....not sure how much of an FPS boost you get. The strong force on the hammer makes it harder for the slide to cycle and slows the shot-to-shot time. Shouldn't affect things so far as function goes unless it's retardedly stiff.
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