As far as everything else, exactly how is that going to be enforced? VVA was created not to take advantage of any exploits, but because VV gets quite a number of applicants every week and it is hard turning away good people or not being able to take a chance on someone because you just don't have enough room. What happens if when VVA gets the 30 members and just to challenge the VV members to stay on their toes, they want to attack their statue? Does that mean that is ILLEGAL now? Or vice versa, now VV can't attack VVA's statue, even when they are fielding 30 people and fulfill all your criteria for the War Phase? That is a tough pill to swallow, especially when there are alliances that already exist in the Mystic War between other guilds. I will come right out and say it...there are at least two other guilds that I personally like that I will never lift a hand on their statue.
My point is, there are going to need to be HARD RULES in place for all these new suggestions to actually work. The game itself needs to completely block anyone under 30 members from getting a statue. That will solve a bunch of your problems and will eliminate the "free xp" that happens when you attack a statue unopposed. Everything else...I don't know how you are going to be able to enforce it, and personally I don't think it would be fair to try, especially when there are alliances all over the place in the Mystic War.
3. Is it okay for sister guilds to attack their own un-guarded Mystics. While there was no clear rule specification on this before, we will set forth to say that it's against the rules from now on. Not only is it illogical from a "war" perspective when you have positioned yourself as sister guilds, it can be viewed as the mystic was intentionally setup to allow sister guild members to reap experience rewards and preventing other guilds from getting it.
How is this any different from the Invasion where guilds used to (thankfully it doesnt happen much anymore) take two and three towns even if they didnt need the xp, just to prevent another guild from having the bonus? Isn't that the whole point of the war, to have guilds use their wits and try to come out on top while playing according to the rules? My suggestion again...if you want the rules to be followed, they need to be HARD RULES and not subjective or left up to the interpretation of each individual person. There needs to be a physical restriction in game that will not let something that you DON'T want to happen. The 30 man requirement for the Mystic War will eliminate alot of your problems. Everything else, especially the whole sister guild thing...I don't know how that is going to be enforced and personally, I think it is unfair to enforce, because I don't know of another GOOD sister guild in the game, but who knows how many unofficial alliances there are already?
That is my two cents, and I hope I did not give anyone a headache.