Right. Just being humble all the time isn't great either. Plus, it's the ethical thing to do.

Literal

Right. Humble-[at-に] come-out [only-ばかり-も] not-quite [and-し]. Also, ethical [copula-ですね].

下手に出る '(to) come out humbly / take a humble stance' is the idiomatic phrase for 'taking a low posture / being deferential,' the opposite of 強気に出る 'take a firm stance.' ばかりもなんだし '(being) nothing but X is also (not quite right) and...' — where なんだ is the indirect 'it's something' that stands in for a vague negative assessment ('a bit of a problem,' 'not ideal'). かつ 'furthermore / also' is a formal conjunction. 倫理的 'ethical' uses the ~的 suffix.