Optimal acute load range

How do I increase the optimal range within the acute load in the training status menu?  It has become very narrow and my typical workouts easily push past optimal into “high”, “very high” or almost always “over reaching”. Believe me, I’m not working that hard.  Weight training does not seem to affect it nearly as much as a couple 1 mile treadmill runs per week. Running a 9 plus minute mile, my heart rate is in the 150- low 160 range which is 90-95% max for usually 6-7 minutes. I run more than twice a week, I guarantee I’m in over reaching status. I’d like to know what I have to do to increase the max level of the optimal range. I’m slowly beginning to really understand the finer points of what my watch is telling me, and how to effectively use it.