Judging isn’t “so subjective,” but there are “up to” deductions. Some take more, some less. I saw it today when we both deducted the same skill, I just took less of the “up to” than she did. There are set deductions, and we really can’t take deductions that aren’t a deduction, if that makes sense. We honestly do spend 100s of hours learning, studying, and perfecting judging. Clinics, on-line clinics, state, regional, and national congresses, tests, tests, and more tests..... I LOVE IT! But it still frustrates me when I’m in the stands and watching and think the score should be different. LOL!
The most subjective part is artistry and presentation, but it’s still only .3 max. Levels 8-10 also have composition, so while the routines may look similar, there’s a whole other set of criteria to apply after regular deductions are taken that are based on “up-to-level” guidelines. Regardless, I understand the frustration, having been on both sides of the table. I can only recommend trying to not dwell on it. Maybe get someone to look at your videos to help you understand the possible/probable deductions better.