Optimizing Major Essence Power

When doing Best in Bags I need to select a Major Essence and click “Find Best in Bags”. AskMrRobot will shuffle minor essences, but in order for me to determine the “best” Major I need to go back and cycle each one and recalculate Best in Bags for each.

Is there any way to let AskMrRobot to factor in Major Essences to recommend which is best without the manual juggle?

Thanks! And thanks for such an awesome website/utility.

Have a look at the guides section for that information.
The website is designed around you telling it what you want to play, “I want these talents and this essence, which gear should I use?”
If you want more detail than the guide is giving you download the simulator client and run a combo sim.