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If I were you I would stop studying so much as you're dealing with diminishing returns on your practice tests. This means that the extra effort you put in marginally increases your returns less and less. You should still study and stay warm but 14 hours a week won't help as much as you think it will. I'd also get the idea that you're just making stupid mistakes out of your head, because that's likely misinformed by hindsight bias. Mistakes are mistakes no matter the reason and if you don't recognize that and make adjustments (whether it's by changing pacing because you rushed or practicing a specific concept because you missed it) you can't improve. Also just know that a perfect score is really difficult especially on the Reading/English section. There's just some element of randomness to it unless you've mastered completely how the test thinks which is near impossible as you'll see questions you haven't seen before. Practice tests don't always define your score either, I scored a 1500 on mine and ended up with a 1570 because taking the actual test usually gets you to focus more, especially if you don't study much. I don't think there's any secret for how to score near-perfect you just need to find what works for you.

I would suggest using Khan Academy. They offer practice exercises for both sections of the SAT, and you can also take full-length tests there. In fact, after taking a test, Khan Academy will find where you struggles the most and give you some recommendations of what to practice. They also have timed mini-section. You can also log into the College Board site. Khan Academy could also use your PSAT score to help you. You can also track your scores. Hope this helps.

I totally get how you're feeling - I'm actually in the same boat as you as I've been self-studying for the PSAT, ACT, and SAT, all of which I'm capable of getting a perfect score on but can't because of stupid and silly mistakes in each section (each of my tests for the past couple of tries have been the SAT equivalent of 1550). What I would suggest doing is to step back for a minute. I can tell that you're frantic about getting perfect scores on these tests - we all do. But if you're plateauing in scores and it's simply because of careless mistakes, I think that means to just take some time off from studying for the test. I'd suggest a week of just relaxing (watching Netflix, scrolling through Tiktok, etc). If you feel that you can't handle a week off, as this is your future you're taking a break from (I totally understand it, I couldn't take a week off either), another alternative I'd suggest is taking a 3 day weekend. Still relax in that weekend; take your mind off the test. It may be just that you're brain is burnt out from studying so often. Once you take this break, rather than jumping right back into prep, take it slow and review the basics first. Chances are if you're making careless mistakes, it's the basics that you're mind is skipping over. Take it slow and then ease back into taking practice tests. I'm actually in the process of doing this myself and I find that going back to basics is really refreshing and helping me score better on mini practice tests. I hope this helps and good luck with prep; you can do it! Remember: even if you are your worst critic, know that what you do is enough. I believe in you! :)