You will heal less HP when you move or attack anyway. And when being poisoned or bleeding, you won't heal any. The bonus you refer from is 'potion's effect increases' from pet skills, increases the amount of HP the potion is healing. For example 10% from an XXL potion, means 2640 instead of 2400.
Then there is HP restore, which means some HP is instantly restored after killing a monster, not sure if it has to be a skill and/or a hit to make that effect work.
In my opinion, all these bonuses are worthless