Thanks for the replies so far! Trigger return spring is stock, trigger link plunger and trigger latch are in their proper places and properly engaged.
Oldgunsmith, you may have misunderstood my original post. The trigger housing moves away from the frame every time the trigger is pulled, then returns tight to the frame when the trigger is released.
What seems to be happening, is that the tension of the trigger pushing up against the hammer dog to cock the hammer is pushing the entire trigger assembly downwards and creating the gap.
Measured the gap with a feeler guage, at it's widest point it's .006.