I'm not a fan of holographic sights due to issues with condensation on humid days and issues with water on the lens during rainy day situations. I'm hunting rain or shine and I don't want any complications caused by an optic which is why I run Williams fire sights on my M2 compact.
The trigger on my compact is actually pretty smooth and it's right around 4.75 lbs so I haven't messed with it. I run the standard recoil spring, as well; I let my action slam home or use my finger to ensure the bolt head is fully engaged in situations where I need to load quietly. I hear good things about the Wolf spring but I have never had any reason to install one.
With an Indian Creek .555 I'm patterning in the high 330's-low 340's with 1 5/8s 9s.