Pete, I really enjoyed your review and I commend you for taking responsibility for your safety.
However, I have to disagree with your reasons for having a full capacity handgun. I definitely agree that under stress it could be difficult to hit a target. However, the idea that blowing off the the first rounds fired until you can get in control of your emotions is not advisable. Firstly, you might not have a "second chance" after the initial contact. Those first few shots might be all you'll have. Furthermore, you are responsible for every round that leaves the muzzle of your gun. What is that miss on the bad guy becomes an unintentional hit on someone else. I completely agree with your plan to get additional training, that's definitely the way to go. Training as well as competition will help you get used to the high stress encountered in self defense encounters.
Yes, I agree. I also use semi auto for the house but only for it's high capacity. Unfortunately home invaders often come in packs and seeing as how your ability to retreat in your home is limited (you may be backed into a corner etc.) having more rounds is an asset, but not just for covering misses. Knowing the safe fields of fire in your house is also very important. You need to know where your backstops are, where you can and can't shoot.