I am sure you are going to be able to improve your tooltips. Healing items with just "heals x % health" would be enough.
More importantly, here is the quick test on the version you uploaded https://mega.nz/file/OcNiWThJ#Ku2KxPDlZ5wV3p1WkjWdc1_u5CFS7maH6XDJZLwIzAo