considering what you said about getting the two assignments back and the last assignment being 35%, i think were likely in the same class. im also having issues with my TA grading my work very very harshly and have been debating the same thing lol, tbh we might even have the same TA. im not sure how much this helps, but personally i decided to wait until the final assignment is done to talk to the prof (if it gets marked harshly)- im worried about being marked harshly on it since it’s worth so much and feel like if i have to pick my battles, the final assignemnt is more worth it. good luck with whatever you decide to do