Congrats on the Glock!
As others have said, shoot it first. Then, with all these suggestions in mind, if there's some way you think it could be improved, you'll know what to do.
A couple of thoughts on the trigger. Some police departments are required to use extra-heavy trigger connectors. Sometimes referred to as "New York triggers," the pull on these is around 8 lbs. I don't know which departments require it, so check it out on your own. If you have one of these, then you might like the stock trigger connector, which I believe is 5 – 5.5 lbs. Or you might, as someone suggested earlier, like the 3.5. Or, since they're inexpensive, you can collect 'em all!
If you do want to use it for self-defense/home defense, keep in mind that some courts might consider a lighter-than-stock trigger to be the kind of modification that would make a gun more dangerous and you more liable. Check laws in your area.
"An armed society is a polite society." — Robert A. Heinlein
"After a shooting spree, they always want to take the guns away from the people who didn't do it. I sure as hell wouldn't want to live in a society where the only people allowed guns are the police and the military."
— William S. Burroughs