I made some calculations regarding spell crit/spell hit values for warlocks at varying amounts of stats.
This was done with both SM/Ruin or DS/Ruin talent specs.
*Disclaimer DS might be slightly off as i have not yet tested if it effects only the spell coefficient or the base spell dmg aswell. These calculations were made with the base spell damage.
*Disclaimer 2 this calculations does not take into account the use of corruption or any other dot i could add it if there is intrest.
Here is a link with a google spreadsheet where you can test it out yourself: https://docs.google.com/spreadsheets/d/1hqjHkevQJ55TFZ7LxWKECld0aP7xIE0fnWpojtlWlns/edit?usp=sharing
To enter your values make a copy of the spreadsheet and then edit the stat/buff and consume values to fit your equipment.
I can provide a detailed explanation of the math if there is intrest.
If you have any questions or want me to add something feel free to ask.