Risk is ever present. You can't possibly know for certain that a future target price will occur before a large drawdown, and possibly unsustainable too unless you have deep pockets. Even if price does come back, riding out a large draw down has an opportunity cost.
I believe you can enjoy watching AUDJPY from today. Just divide the account 10x, and entry is 1x. Then we can continue.
I am not following you here. You started positioning short from 99.87? correct? You are breaking the short into 10 trades....adding at intervals from 99.87 up (I don't know where as I don't know your upper limit for the trade). You say we could have banked 10% profit shorting an asset which has gone up to 100.50? Tell us more