My friend, Bill Zygot, was a musician in the Casinos for 20-25 years and he was an avid Blackjack follower and player. He wrote a book about Blackjack that Casinos are loving to hate. Many of your ideas are just plain wrong and it is total luck you are doing ok. The majority of players will lose using what you say. You should read this book ... and especially look at the #1 rule in Blackjack. It will save you tons of money. I have used Bill's method at Reno, Las Vegas, Michigan Indian Casinos, Bahamas and others too numerous to mention............and, I HAVE NEVER WALKED AWAY FROM A BLACKJACK SESSION A LOSER....NEVER. I am retired and financially sound so I don't need to go to a Casino every day of the week. I really go for fun and a change. I love to see the tourists just plainly make mistake after mistake. It's simply entertainment for me. Here is a link for his book and good luck in the future:
How to Win at Casino Blackjack