Yes, those mainsprings look like they'd be off of a hammer gun and/or sidelock. They're pretty similar to a set of springs from an old LC Smith that I used to own. The dimensions look identical. Mostly, it is the squared off end with the sharp grind on the longer leaf that makes me think LC Smith. However, I have never seen the mainsprings from an Ithaca NIG (hammer model). I would think most leaf mainsprings would look nearly identical (LC Smith, NIG, Baker, etc...).
If the sear springs don't produce enough force on the sears using those mainsprings, you'll probably have to replace them.
Try the quick hammer install that I posted above to see if there is anything amiss there. Frankly, I find it strange to have to wedge the bend of the spring between the top of the receiver and the mainspring strain pin.
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