The spread of 10 documents is not necessarily anywhere. There is this guide from Tech Nation https://technation.io/visa-tech-nation-visa-guide/ which is all you should read (>10 times). Evidence can be different and can also overlap. You’ll get a feel for what goes where and if you should have an overlap or not. A lot of things will become clearer after studying the guide. Mind you, the 10 pieces of evidence are even labeled as optional in the Tech Nation application form (if my memory serve me right).
In summary I’ll say submitting an application is more of an art than science so there is no single fixed formula.