I stood up for him and said I had always found him to be honest.
本句中的 to be 用得对吗？
句子完全正确。to be 的使用方法没任何问题，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. 他们感觉他非常招人喜欢。
The doctors found her to be perfectly fit. 大夫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. 他发现念书是个非常不错的消遣。