The procedure I used in the 182 (H model-1965) was cowl flaps closed and 20" 2000 rpm and a lean mixture 1 1/2 miles or 1 minute before the drop, then hold 20" 2000 rpm and a lean mixture (around 150 kts) all the way down to base then a slow reduction of power slowly bring the mixture to full rich and a slow increase in pitch till full fine on finals. have used this procedure on 600 odd hours of skydive ops and ive never cracked a pot average sortie time of 0.5 for 5 pob and 0.6 with 6 pob (tacho). we did use 20" and prop full course for a while but we blew out the prop guvenor within 100 hours.