Release date for first 2019 starter decks: February 16

When you say that these effects are optional, does that mean that you can choose to not be "Perfect" on action 1, but instead on action 2?

Side note: are judges supposed to stop people from transferring out their full vampire if they realize their mistake after they have passed the turn? Discarded?

Yes, you can choose to be "perfect" on action 2 instead of action 1.

And yes, if you have begin your discard phase and you don't have put in play a full vampire (even if it is just replace your Unmasking), it is to late to do it.

Close, but not quite. This series of changes in the rules adds to the tedium of things you need to remember or your game gets messed up.

If judges *must* enforce the rules strictly, which I think they probably have to, then the game gets very technical and small mistakes can cost players precious turns. blood, etc in addition to the other ways that happens. If they don't have to, some guidance would be helpful regarding the new rules, maybe just a reiteration of how judges handle these kinds of issues.

Actually, these changes make the game easier to judge.

For example, before that, you could have someone making an unblocked action with no reaction played, the player forgeting to add a blood for the perfectionist. Unlock and then, being blocked on a second action.

Both players begin playing combat cards and mid combat, the acting say "oups, I didn't gain my blood with perfectionist" it could change a lot of things like which cards the blocking chose to play according to the number of blood on his opponent and it could also have changed with which minion to block according to the number of blood on the acting vampire.

With the blood gained with perfectionist being mandatory, the judge has to remember if indeed nobody played a reaction on the succesfull action and then has to decide how to handle the misplay. Just giving a blood to the acting vampire being a way to do it but rewarding the acting player with beneficial outcome for a misplay. Which is IMO a bad way to do it. But doing a rollback to before the second action begin is way too disruptive.

So the Judge had to make a decision which would be a bad decision.

Now, it is easy : just roll with it and next time, don't forget your blood if you want to have it...