I’m struggling to progress on leg press and don’t really like the way the machine in my gym feels. On my other leg day I do 2 sets hack squats and 3 sets leg extensions and progressing well. Would it be best to do hack squat instead on both days or would it be too much to recover from?

My left leg is noticeably smaller than my right and a fair bit weaker(2-3 reps) when doing single leg exercises. What would be the best way to bring it up?