I've been ranting about how the crown enchant is too difficult and how depth2 feels unrewarding to farm, but thinking about it, I agree with this post that the conversion rates is the main problem. We drop tons of lesser ores every time we farm there, it feels unrewarding only because we can't convert them to the materials we need so they're left to rot in storage.
The main problem is the number of Coagulated Spell/Contaminated Magic/Temporal Crystal needed in conversions.
Temporal Spells are much easier to obtain and not needed as much in conversion, so it doesn't need a change (hell I wouldn't mind even if its required amount was increased a little)
It's up to the staff of course, but in my personal opinion reducing Coagulated/Contaminated requirement to around 5ea each per conversion, and reducing Temporal Crystal to something around 10ea, would be a good change to fix all the problems with depth2 farm/crown enchant process.