These kind of suggestions continue to amaze and amuse me. The game mechanics revolve around buffs and you want to change that? I vote NO! There are so many buffs available now that specifically help the defender and some are nearly "win button" buffs. When you consider how game changing fumble, high guard, golden shield, dispel curse, invert, fist fight, smite, and sealed are to a defenders role, then perhaps you would understand that defending against attacks are easy! I know some of those buffs are useful for attacking as well but you can't rely on them to activate to win. Sounds to me like you want to win without actually defending in the game style of pvp. This doesn't even consider the fact that any player can buy pvp protection or lock their XP at anytime for a relatively cheap fee.
It appears you have put a lot of time and thought process into your suggestion and I commend that. However, I completely disagree with any of the changes you've suggested.
Buffing up doesn't work on random attacks, as attacker can decide when to attack. Keeping buffs in such level that it will dis-encourages all attacks would take like 60 or 70% of daily stamina gain, and it would also require putting alarm every 2h to rebuff myself. So, not an valid option. Maybe you just like hitting other so much that you don't want to give them any chance, for example revenge? xp lock and pvp protection don't help against random attacks, nor gold theft.
Like said multiple times in this topic, I don't want win button (pvp'rs already have that), but to have fighting chance against attacker. Once BB did the trick, but not any more.