I have a habit of sticking my crosshair too close to the angle. Not dead on but definitely too close. But deathmatch doesn't feel that great for figuring out how far from the angle I should hold. Is there a better exercise?

I really want to seriously improve my raw aim (crosshair placement aside) and get that snappy, Tenz-like precision. Obviously it will take a lot of work, but which methods do you guys use the most? What is the most efficient use of my time...