Recently I've come across one article which I think you could find helpful. Someone will take a steaming dump all over it, but it answered some of my questions. 
http://www.liketrailers.com/knowledgeable-essay-crafting-provider-is-your-6/
https://rayandmikesdeli.com/help-me-do-my-research-paper/2017/solid-and-reasonable-online-editing-service-2/