The issue with gold is that it's essentially unfixable as long as you can always just hit end turn button and farm resources infinitely. No matter what gold sinks or tax mechanics there is, you will always can get infinite gold by infinitely skipping days. There's a few ways to prevent it but ultimately neither will be considered enjoyable by majority of players: hard time limit so you can't skip days and play infinitely; regular evergrowing threats to keep players on their toes (basically softer time limit), removing 'set and forget' tasks which are used to farm infinite resources. While I do consider setting universal time limit for each act at full story completion, I'm pretty sure many players will request a sandbox mode where it isn't a thing at all.
Also you can upgrade your item quality so you don't have to simply roll for it.