akuraI've got a bigger desk, a better chair, a bigger monitor (although still 60hz), a better mouse, and a significantly better pc, which averages 500+ fps on tf2 with the highest settings possible.
akuraI've had this computer since mid June and I have not made any improvement whatsoever.
I hate to be that person who reads a long post about gameplay/experience only to tell you to buy more stuff, but with the fps you're getting I would really consider upgrading your monitor to a 144hz. It's not gonna magically fix everything but I think it's absolutely worth the extra cash if you've already spent money on a nice setup. I *do* think you'll notice the difference in how your aim/movement feels compared to what you were able to do on the laptop.
I also have to sorta agree with mustard's second point that it sounds like you might be getting in your own head a bit. Everyone slips up sometimes and it's obviously frustrating when you beef and it just ends up killing your medic or something, but that stuff happens to everyone. Stats can definitely be important, but when you reflect on your own games I wouldn't worry about them as much as like specific moments.. On combo scout you usually know when you made a mistake or like a bad call or something. Learning from the bigger mistakes and looking at them with your team can help a lot to get different ppl's perspectives and prevent them from happening in the future.
If it's like a mistake that is purely mechanical I wouldn't read too far into it. As long as you were putting yourself into the right 'spots' or situations, you're going to hit those lower dmg shots more often than not. It sounds like you're already doing enough stuff to help with aim.
I also completely agree with what Mae said. Try not to worry about what your teammates or other people think about you, at least, the types of ppl who are gonna make comments or sigh when you come up short.. As if they've never missed before. It sounds like you have plenty reason to be confident based on what you wrote here. Good luck!~