The golf swing is a fragile thing. If you're playing well, don't change a thing. I've read that Spieth did try to gain distance. You can easily lose what you had if you try to get better. I don't know why anyone at the top of their golf game would try to get better -- considering the fragile nature of the golf swing.
It’s not too hard to set up a hitting area. Get a net, a mat and swing away! For you guys in the frozen, dark, cruel world of winter hell its a good time to hit YouTube for some golf specific exercises too!