Tips for an Arcanist Counter-Speller?

[Kyros731]

I am currently in a campaign using an Occultist Arcanist. The exploit for counter spelling caught my eye and got me thinking, are there any good feats/items/magical abilities that improve this or make it more useful?

[Kurald Galain]

Try the trait Spell Duel Prodigy.

[Kyros731]

Thanks! That's pretty handy for a trait, any others?