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]


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