*sighs* as i was so detailed in explaining why i think that the changes you propose are bad i dont quiet understand where i could have been even more clear, but let my try anyway
No, you dont need a way to store heat as there is already a way to store heat in heatstones, not having to do the extra steps of collecting memory stones and a heat infuser to create them would make it too easy
No, a worshipper should only be rewarded by the protector they serve, if they deem that as appropriate.
No, we do not need MP6 to be able to fight with mp3/4 as there is already MP7 that can do this, in the first place you can only fight within your mp level and alliances give you the ability or rather grant you the exception to cross mp levels for fights
No, as you can not influence who follows you, you should not be punished for something you can not influence directly, furthermore is the power or rather the abilities you get from being MP6 more like a privilege and losing the privilege is enough punishment already
in conclusio
PS: please read this