Traffic backed up almost to Killdaire because the light is too fast

We've observed the intersection and see that the delay happens around noon-12:30 p.m. and 4:30-5:30 p.m. Additional "green time" has been transferred from Tryon Road to Crescent Green at the noon peak; however, due to the amount of traffic on Tryon Road at the 4:30 p.m. peak, we aren't able to transfer green time to Crescent Green then. From our observations, at least 14 vehicles should be able to make it through each light cycle. Thanks for your input!