Painting Problem Questions

73AbodEE - I am spraying Epoxy not High Build.

Louie70Dart - I have tried several different combinations. I have tried fast and about 6-8 inches (poor coverage decent result) and slow 6-8 (best coverage and result). I have tried slow and about 10-12 (poor coverage and LOTS of waste).

What would be the best combination? Also please don't forget about my secondary questions.