[disclosure: I'm not a native speaker of English]
I work as a university professor. When writing up lecture notes as well as research papers, I have a tendency to write things like the following.
A Monte Carlo simulation shows that Factor A is a significant one. Additionally, it also shows that the outliers can be grouped together as a special case.
The question is whether the Additionally...also sequence is a stylistically acceptable one, given that both additionally and also convey additivity. I keep on using it because using just one of the two sounds weird, in a way that I really can't put my finger on (but then, this might be because I don't speak English natively).
If Additionally...also is deprecated, I would welcome suggestions of alternative ways of expressing the same meaning.