句子完全正确。to be 的用法没有任何问题，当然省略这个 to be 也可以。

类似的例句比比皆是：

I found her to be relaxed and assured. 我发现她放松而自信。

They found him to be charming. 他们觉得他很招人喜欢。

The doctors found her to be perfectly fit. 医生们发现她身体完全健康。

I found myself to be in a minority of one. 我发现自己是孤家寡人。

He found reading to be a good distraction. 他发现读书是个很好的消遣。