• Make features utilize relative height scaling.
• Placement modifier order matters; make sure all features are reflective of vanilla ordering to make sure they're correct.
• Aerclouds
• Large Aerclouds
• Crystal Trees
• Holiday Trees
• Flowers (separate bushes from flowers)
• Grass.
• Bushes need to have lower densities in clusters
• Quicksoil.
• Lakes and springs need to be more common.
• Fix trees spawning over lakes.
• Ores
• Ensure configurations and placements are both all accurate.
• Balance between b1.7.3 and 1.2.5

The original mod's chunk generator could work as a good reference for relative balancing of features such as Aercloud rates per type. It seemed that golden aerclouds were meant to be slightly rarer than cold aerclouds.