You certainly seem to be ahead of the curve organizing your financial life--congrats on that!
Your budget seems to cover base things, but is missing a number of typical services and sinking funds. Perhaps they are covered by your "misc" category, which is your #2 category. (By the way, that's a hint that you should break it down more) things like clothes, grooming/haircuts, travel/vacations/entertainment, and transportation/car/bike/train. Knowing these better will help you make better decisions when your life changes, such as when you consider moving or buying a house.
Your savings balance seems low--you have less than 1 month's spending in reserve. If you couldn't work for some time due to illness or injury, or encountered a major expense, you would be in trouble. Shoot for 3 month's expenses--it won't be a stretch.
I hope you understand the risk of a margin account. If the market is down, it's not just the margin at risk--your broker will call for cash, or sell your stocks at the worst time to get their money. I can't think of a single Mustachian, or for that matter a single FIRE'er, who got there by putting their account on margin. If you want to learn while playing, fine do a bit--no different than P2P lending or cryptocurrencies, but 30% of your taxable account puts you in danger of wiping out at the next big market drop. And, looking at 10 years since the last one, you are closer to a big drop than you are to a bonanza that you double up on because you are levered. This is the dumb item on a smart list; there is no need to try and be that fancy.