FirstOfficer.io now tracks changes in subscription quantities and books them along the other upgrades & downgrades.
It also tracks other changes. So if you charged $15/month last month and just modified the plan, the change will be detected as upgrade/downgrade.
Also changes in currency exchange rate will be detected and shown in upgrades/downgrades.
We’re working on Upgrades/Downgrades View to show the capacity changes separately. Until that the changes are shown along with all the other upgrades and downgrades.