The chances go HUGELY down when you're trying to push the limits of a property an item already has.
It's pretty darned easy to slap 10 swing speed on a bow with none. With that one, you'd be trying to add 10 onto 30.. and things get dicey.
Same for adding anything. Add 40 luck to a piece with no luck.. easily done. Add luck to a piece that starts with 100? Crash, tinkle, smash.. gone.
Doesn't mean I wouldn't try it, IF, like other folks said.. you have another bow to replace it. If not, that is one damnfine bow. It will serve you well.