To be frank, don't equate what you can pass with your skill level, especially since you've only played for 8 in-game hours and are 1.7M. You aren't hitting a skill cap, you're really just mashing your head against a wall that you have literally none of the tools required to scale it. If you want to play as a pass player, that's fine, and if you want to try your hand at passing stuff at least 3* above where your skill level is, that's also fine, but let's not call it a "skill cap", please. Play stuff at the mid-1* range for now, and with effort and practice you'll be able to play 4* maps like they're nothing.
If you are having mouse issues regardless, though, AWW's advice is solid. Alternatively, try messing with the mouse sensitivity and see what works for you there.