At what point is there too much AP?

I have a ton of of great discs for Nangong thanks to very lucky rolls I got for Vivian in the past. I’m sitting at 2900ATK/350AP (D5 is ATK%) which is already an exceptional build.

However, I have discs that have less ATK+AP rolls total, but higher amounts of AP. It’s enough to get me to around 380AP, but I’d be sacrificing ATK. Is full sending AP better for Nangong, or is balance key to not oversaturate any stats?