I'm pretty much pain-free right now. I'm not getting too excited because this has happened before and I've relapsed for no apparent reason, but anyway I find even when pain-free I still experience spasms down there but there's no pain. It's an uncomfortable feeling, though. If I'm feeling anxious I really notice it, like it's opening and closing quickly, but without the horrible pain I had at first. Anyone else experience this?

I can relate to this feeling.

This means that area of fissure is smaller than before(healing) or sphincter is less powerful(due to LIS). Muscle reacts, but not like it did before due two reasons mentioned before.

I experience uncomfortable feeling like spasms, usually it serves me as signal to pay extra attention to things down there.

If things will get worse, irritation increases, thus muscle reacts accordingly and may reach state, when it is painful, not uncomfortable anymore.