Perhaps you could use only black for the arrows so that the user knows of the increase or decrease, place them on the left, and then on the right use a "health-bar" style status report which would look professional and could indicate the positive/negative aspect and even severity. (Use colors other than Red/Green if you are worried about color blind issues)
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(*NOTE: My colors may not correlate to arrow orientation as I just did it randomly without trying to uncover which arrows are good (green) and which are bad (red))
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*(Also, the arrows may not even be necessary anymore if you are adding these visual ads, sorting can be changed to performance based (i.e. 'good' v 'bad') instead of directional based (i.e. 'increment' v 'decrement')*
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[![enter image description here][1]][1]
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If color is an issue perhaps you can use a non-color-dependent performance indicator like this: (*Note, you can still add color to these to make it even easier for 99% of your users to read, it's just that color-blind people will still be able to read them even without the color information)—
Color indicative version on the left, color-blind simulation on the right
[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/joT5Zl.png
  [2]: https://i.sstatic.net/rf8mol.png