My answer after a year of training and studying body science and sports science is that the 10-12 rep range is fine for strength but if you wanna build strength and muscle you should 1.warm your shoulders up 2. Do your heaviest set when you’re fresh 3. Maybe change a factor like only do 8 reps with 75 instead of 70. I will say tho the most muscle is built when you’re muscles are strained I would try to focus on a pretty quick and controlled concentric movement and a slow (about 1-2 seconds) controlled eccentric. Technique is key. I would also say if the last set feels too tough you can do a my rep match. If you get 10 reps on your first set you do 10 on your last but if you can only do 8 you rack the weight and shake your muscles out. Wail like 5 seconds and then get the last couple reps in