Dick Johnson's recommendations are still correct even with winglets. Each glider is different but I have found that S-H gliders climb better with aft cg and a slight slip. Does not require much and generally the glider feels like it has found its groove.

Winglets are strong enough for slips to final and increase the safety as the glider is less likely to spin with the winglets, especially earlier generation models like the ASW-20 and Ventus.