Right now I'm sitting at 65 dew and I need 200 for the Sieglinde refine. How do you all farm Divine Dew? By refining stuff? I only have 25 refining stones and am about to get 14 more from AA.
Answers
I personally don't use them all that often. Majority of the units I use on a daily basis either only needed the one upgrade via stones or don't have a refinement.
But if you're really need of them, make sure you do AA every week(Sounds like you do), make sure you get the reward for RD, and lastly just upgrade your 5* weapons for units that need them. If you're going to run AA, may as well have a lot of units built.
If you are only getting 14 stones today, you aren't doing the best in AA. Are you starting it with a merged team? Does this team have high SP skills? Is your run deathless? Are you using 7 teams of all proper seasonally blessed heroes?
Seems you may need to adjust if you aren't meeting those conditions. I normally get about 19, which then 5 stones don't sound like a lot, but add that up over weeks and that's additional refinements.
If you don't have a good merged team, then that should become a focus. Determine which units you have many copies of, and make some 5*+10 merges. Or pick favorites. Make sure Alfonse, Sharena and Anna are 5*. Feathers are farmable if you are willing to put in the effort. This is accomplished with HM farming using Rival Domains.