Should I hire employees or use 1099 subcontractors for better quality?

We have 6 subs full time and it's burned us a few times. We go behind them on ~25% of jobs. We just got CompanyCam and that'll help operationally. But, I am considering going the employee route and paying hourly. 

What do you feel works best -- to maximize profitability, ensure quality, and reduce headaches?