As for parameters, I've cranked my first layer speed way down (20mm/s) and put my print at 80mm/s build. I use a 175 travel speed, with a minimum travel of 3mm on retract, a .75 minimal retract, and a .075 hop when retracting. I've gone higher, but I don't like the extra jerk that seems to give. Typically print at 195, but that's going to be filament specific. I'm using the inland PLA I picked up at MicroCenter. Seems to like running a little hotter.