I am considering two techniques for lowering my specific gravity but am unsure if my methods will work. I am currently fermenting a bock style. It's not a true bock because I don't have the ability to lager, so I used an ale yeast, specifically, Safbrew T-58, per a friend's recommendation.
My original gravity was 1.071. After taking 5 measurements over the course of a week, the gravity has stopped at 1.025. I was hoping for it to be a little lower, but I became concerned when I read this yeast may not be ideal for high alcohol brews. Temperature has been ideal according to package. I can't do much about room temperature anyway because my brewery is a spare bedroom in my house. My conclusion is that fermentation is not prematurely stuck, it's just the yeasties are are maxed out and done all they can do.
I bought some nutrients and a pack of Safale K-97 dry ale yeast which said "high attenuation" on the package. I don't want to make a whole starter and repitch because I'm worried that will void out my previous SG readings.
So here is my question. Can I just agitate the wort a bit and repitch the new yeast with the nutrients (without making a starter)? Do I need both or can I just add one of them? Should I be satisfied with this? I feel that the beer is too sweet right now. Primary fermentation finished almost three weeks ago.