Summoner balance issues!

[Shikiseki]

TBH the only issue they should look into are our Archer cross-class skills. Only 1 of them is truly useful (Raging Strikes) while dex+ is useless for our dmg and we share hate with our pet already so it's not really worth getting as well.
Maybe one of the crit+ attack to have occasional burst-ish potential with Energy drain/Ruin/Ruinra/Miasma Burst
Also, I usually combine Ruin and Ruinra since Ruinra will immediately launch right with Ruin - you'll be sitting on the GCD though that's when you have time for Rouse/Spur/Miasma Burst/Energy Drain/Bane/Virus/Pet Management or running xD

But other than that, just try to control your pet that it attacks your target with sic/obey.

As for Aurum Vale - I found it was a complete nightmare as Summoner as you don't have a debuff cleansing spell and I've yet to see a healer use an Esuna on my pet *lol* - you're just better off resummoning the pet with swiftcast.

I wouldn't worry about later content though, 2 Summoners on AK and even WP will destroy everything - if your tank doesn't pull everything at once that is...
Observing and Strategy shifting is the base of this class, you should always come up with the best strategy according to your party composition and communicate that with your party. Once you do that, your chances of winning are 94,837% x)
Strategy ftw!