The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
I'm a little late to this party, but Dungeon Magazine Issue 101 on page 16 has an article by Frank Mentzer called "Plan it by the Numbers" and it details the specifics of encounter design based on party level and the difficulty that you're looking for.
A link to the issue is listed below...
The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!