First, the P11 is an older model, the PF9 is new, and the trigger has been improved. Still a long pull due to it being DAO, but smoother.
And as far as +P ammo goes, if you are going to trust your life to something, why put rounds through it that it wasn't designed to handle, and risk a malfunction or worse. They are very small lightly built pistols, and are not designed to take the punishment from +P. From what I know, there are no SAAMI specs on .380 +P, so you have no real idea how much extra pressure you are putting through the pistol. Also, you will beat the thing to death. Why abuse the pistol you count on to protect you when your life is on the line.
If it was my life, I would stay with standard ammo, and not risk damaging the pistol I use to protect myself with. Buy enough carry ammo to test the gun and leave plenty to carry. Break the gun in with target ammo, and practice with it as well. You only need to run enough carry ammo through it to ensure reliability, 100 rounds will suffice after the pistol has run well for a few hundred target rounds. Then save 20-40 rounds to carry. There is no need to risk hurting it with +P. You are a free stater, order enough carry ammo to last you through test and carry, even if you have to buy ammo from several sources. There are tons of places to but ammo online, and tons more in NH. Or even consider having your local gin shop order you 150 rounds of carry ammo, it may take a bit to get it, but it will be worth it.
Like I said, only my opinion. It's your life, do as you wish.