I’ve seen good results from starting in low 90s the bottom of threshold, and ratcheting up every 5 minutes or so. And then hang just a little below threshold like you said. Undulations in the road, and wind, will naturally generate small surges above.
And the significantly over unders are pure gold for me. Out on the road it is really easy to adjust the over power, depending on how I feel. Big bang for the buck.