As everyone said, no need to buff here. I play it all the time and absolutely love it, even so more then my all time favorite, Tirpitz And to be honest, both ships are played very similar except that Scharn can't tank like Tirpitz so you got to be careful when playing T8 battles and higher. I think I avg over 75k dmg with her per game and I mostly get stuck in T8/T9 battles. I have no problem doing 7-10k dmg to Iowa's and similar over 15km range but as everyone mentioned...get close, 7km range if possible to use secondaries, angle your ship and torp. Just yesterday, I did than and successfully tanked DG, 2 dd's and a CA. I died, of course, but not before torping DG, killing both dd's with secondaries and sinking CA (+150k dmg game overall). More accurate guns then Bismarck and Tirpitz IMO but again sometimes at longer distances, your shells just bounce off bb armor. Very maneuverable too, and if you know how to bb, dd's wil have hard time hitting you with torps.
On the other side, as Tirpitz, she is prone to fires so you have to be careful when engaging T8 and above CA's because you can burn in matter of minutes.
Overall, great ship, if you know how to play it and what is more important, so much fun. I bought it for rank matches few seasons ago cos I couldn't use my NM (which I love dearly) and at first, I hated the damn thing. Couldn't penetrate any of bb, couldn't do any dmg and so on, but over time, I learn hot to play it and now I play it more then my Tirpitz wich is crazy
My 2 cents