Love 1100's. Love mine. Any idea how many rounds through it? Extractors should be a maintenance item, is there a low drag follower in already ? Common when adding the extension.
The XS sights are very nice, but
You can do fine with a bead front sight, you may find you want to swap the barrel and/or throw that cash at choke tubes.
How well does that suit your physical size? The first thing I would do is swap out the furniture for some plastics; save the wood.
You may find a short stock fits better and is easier to manipulate.
You can find foregrips that will make quadloads much easier than the wood. And with plastics, once you find your grip on cheek weld, the plastic is easily stippled, sanded, mared, painted, etc..
Something like this
Plastics w/speed feed foregrip
Or this
pistol grip stock
The price of shotshell holders will add up quickly.
Practice loading, both hands, a lot. Practice loading 2-3 times more than you shoot. I keep a bucket to unload shells into at the range when loading practice, then practice loading while walking, if you have somewhere safe. For most of my local matches, loading is a huge time killer for alot of guys.