Well Stink, I am not a trader, but...
I do not believe you should set yourself profit targets.
If you are gonna trade trends, or charts then
Trade the trend. If it's going up hang on to it regardless of what your goal was or is.
Also I undestand you may put in about $5,000 per trade??
So 15% of $5,000 is $750, less $40 brokerage, and 50% tax you've made $355. Which equates to about 7%.
Not much is it? You need to bag some big winners to get anywhere, and you're not gonna do that if you set profit targets.
Trade the trend I say.