Making corners sharper

When I print objects with sharp corners such as cubes, they tend to come out with a bit of overshoot which makes them less sharp. The degree to which this happens varies with speed. In this example (https://goo.gl/photos/RMtmSzh5XiM2tcd9A) the same object is printed at 45 mm/s and 20 mm/s, with a noticeable difference, for example on the cube in the top right of the object.

Does anyone know a way of keeping sharp corners without compromising the speed? Perhaps by changing the acceleration or jerk parameters, or by some setting in the slicer? While I could print all objects at the slower speed, this isn't always satisfactory, for example on a large object which is mostly round with only a few sharp corners (such as some of the larger parts of this: [www.thingiverse.com]). My X and Y acceleration are currently 3000 mm/s^2 and the X-Y jerk is 20 mm/s, though I couldn't tell you where I got these values from. The printer is a FolgerTech 2020. I've run experiments with changing other parameters such as temperature and using Cura instead of Slic3r with no significant difference.

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See my blog at [moosteria.blogspot.com].

Lower your acceleration values to 500. This will slow down at the corners, but speed up on the straights. Start at 500 and tune up or down from there