Hi Nicholas,
Answer 1: Leverage does not matter when using the Prop firm with the three levels of risk.
Answer 2: I am not sure if all-in or raw spreads is better. Can you tell me what prop firm or brokerage is using these two so I can research them to see which is better.
Answer 3: I would not do any scaling until you have half your profit target. Personally, I do not use it. It is a way to get funded quicker, it is also a risk of a large draw down of your account. Personally, I prefer to just let the account take a little longer to reach the profit target, but then again I am a conservative trader.
Alan,