After you loosen the locknuts. Tighten the center post down to 72 inch/pounds on both bands.
The rear band you back the center post out two turns after the 72 in/lbs.
The front band you back off 2. 5 turns after the 72 in/lbs.
Retighten the locknuts after you get the required settings. Do not let the center posts turn when you tighten them.