Anyone have a recommendation for a string trimmer suitable for 6' tall people? I've tried a number of them, both bent and straight shaft, and they all require me to bend over. In order to get the string cutting parallel to the ground, I have to hold it down almost to my knees, which gives me a terrible back spasm by the time I'm done. Plus, it's really hard to get an even cut having to guess how much to bend. I'm always wishing for another 6" down to the ground. My current machine is a bent shaft Stihl, one of my favorite brands otherwise.