I frequently see medical tests where a measure is "flagged" as too high or low compared to average. One I always get is my blood HDL is too high. The HDL is the "Good" cholesterol and so the fact I am higher than average is not a bad thing. I feel much the same about EF. While it is possible for these measures to be too high, I don't consider you being a little over the average is bad, I think it is good.
Others may be able to give you a medical view, I assume your doctor as. In this case non comment is the same as good in my mind.