I think the situation was similar in San Diego. When the yellow duration was reduced, the red in all directions duration was increased to compensate, in order to maintain the same safety margin, while at the same time increasing the number of red light camera infractions. I don't if there were any cases where the safety margin was reduced, since that would probably trigger lawsuits, especially if an accident occurred.At the end of the left turn cycle all lights stay red in all directions for 2 seconds to allow traffic to clear the intersection.
I'm not sure why turn after straight would be safer. In California, you have turn before or turn after, sometimes depending on the direction (like north is turn before, south is turn after). Some intersections have smart controllers with sensors further back from the intersection to set red and green lights for straight, left or right based on traffic patterns with a default setting for the most common expected traffic pattern.The turn arrows come on at the end of the straight thru cycle rather than at the beginning. This is supposedly for safety reasons.