In order to see if Sasuke is fighting at full power, you need to ask a few questions. Here are my question and answer to help.
1. What does full power mean for an an uchiha (Indra reincarnation)?
Without trying to assume that Sasuke = Madara, I think Madara is a very very good start to figure out the full power of Sasuke, just as Indra reincarnation. Going by this, Sasuke's full power is Perfect Susanoo.
Now, you will say that Sasuke has also received power from Hagoromo. This bring another question.
2. What is the full extent of the power that Sasuke got from hagoromo?
This is where the true question is, and I assume that the OP is talking about it. Well, if we want to answer this question, it can only be playing prophet game because no one really know it. However, my personal opinion is that with Sasuke's body, the fanbase should not expect anything from him that can get him to go toe to toe with Kaguya or any villain at the level of Kaguya. Basically, by just looking at Kaguya, we can decide that only Naruto can fight her.
Thus, if the thread is seeking to find out if Sasuke in his current state can match Naruto, then I will encourage the OP to seat and expect disappointment. I believe that folk should start reading the manga seriously, and recognize that Naruto is a powerhouse that Sasuke cannot match with his basic Uchiha body and human chakra. Naruto is far too strong, and in order to make this manga enjoyable, Kishi will have to let us see him go all out. For this, Sasuke will have to be knocked down.
So folks, be ready for another team 7 vs Gaara or team 7 vs Haku moment. Sasuke will go down and let Naruto go all out because Naruto has too much power to be limited to simple Rasengan. It is time for the Uzumaki to show us what it mean to Uzumaki - the Last.