Please change Undead Mastery to a flat bonus instead of a percentage

When leveling the Undead Mastery perk, it does little to nothing to increase the damage of an Undead pet. However, when you equip the Staff of Death which gives a +1 bonus to Undead Mastery. This simple bonus gives a far more noticeable increase in the damage of Undead summons than training the passive up.

Now I know the staff also gives 50% more Death summon effectiveness, but I do not believe that is the cause of the damage boost. That is because currently I have a bonus of 127.1% Death Summon effectiveness, and I hardly notice any changes. I also have a friend who has GM'd Undead Mastery and the only noticeable change he sees is when he equips the staff.

I think this change would go a long way into making Undead summons far better than what they are now.