The very first sovereign I created is a T6 Chill that’s a hodgepodge of every biome I’d seen and enjoyed over the years (plus a couple of others from the list that looked nice), so I can totally understand the love you have for the first one that you made. 
Mine is pretty average for most gatherables, as that wasn’t something I was really thinking about when I made it, but I still think it’s lovely. If you want to take a peek at it, you can find a portal to planet “Cordana” at the Portal Seekers Shedu Tier Hub.
“Poison Plateau” includes a number of pools with random blocks of gleam in them on the flat parts of the biome, as well as a number of buttes that can feature either small trees with growth blocks sprinkled throughout the foliage, or large flowers similar to the ones in “Sunflower Field” on top. As far as Ancient Corruption goes, you should be able to get some on a T4 by selecting the “Sunken Forest” biome.
“Pitfall Field” appears to have diagonal shafts, but I believe you would need to roll a T5+ planet to have access to that selection on the Sovereign maker.
