Quoted from "effervescent;490864"
Healing Bonus isn't the same thing as Healing Power Increase Points. You lost a ton of HPIP when switching to the Raksha Staff, which is why your heals went down, even though your mdam is higher. Mdam and HPIP both play a role in calculating healing output, but HPIP will raise heals much faster than mdam will.
As for the number calculated on your character info screen, it's roughly half of your current mdam, which is why it goes up when you switch to a mage staff. It has nothing to do with HPIP, which isn't shown in character info.
Quoted from "effervescent;490864"
Healing Bonus isn't the same thing as Healing Power Increase Points. You lost a ton of HPIP when switching to the Raksha Staff, which is why your heals went down, even though your mdam is higher. Mdam and HPIP both play a role in calculating healing output, but HPIP will raise heals much faster than mdam will.
As for the number calculated on your character info screen, it's roughly half of your current mdam, which is why it goes up when you switch to a mage staff. It has nothing to do with HPIP, which isn't shown in character info.