This game feels amazing to play and I finished both stories, but I was a bit annoyed at the presets: basically I mostly have the same main equipment most of the time and only change rings and when I buy new equipment I have to update all of my presets (of which I usually use 2 or 3). It would be cool if you could share slots between presets, here are some ways in which you could do that:
1. Preset 1 would define what equipment "empty" slots are in other presets
2. Add a new pseudo-item which would copy equipment from a given preset
3. Have a "base" for a preset, which would replace empty slots with items from a different, selected preset
4. Add an "equip on all presets" button next to the regular "equip" button
In all cases I think the "copied" item should be a ghost and not at full opacity so the player knows its a copied item, and if it chooses from a specific preset maybe add a "number badge" to it.