Several of these accidents were attributed to factors other than the amount of cycles or hrs eg. Aloha 737 lap seams being scored by metal tools during removal of sealant for inspection. HRS and cycles are a poor measure to use, hard landings and turbulence could fatigue one aircraft at a much faster rate than another.
Be better off pulling DFDR data and calculating the measurement of accelerometer data (would need long term measurements) say monthly, accumulate this fatigue and update the aircraft with it's life index accordingly.