A Couple of Anti-Slides

Please note that the color of this puzzle varies.

As the name of this puzzle implies, there are two anti-slide tasks to this puzzle and one bonus packing challenge.

Task 1: Pack the pieces of Set 1 (4 pieces as illustrated on the instructions) into the tray so that no piece can move ('anti-slide')
Task 2: Pack the other four pieces in Set 2 (also illustrated on the instructions) into the tray so that no piece can move and that the pieces will form a symmetrical shape at the same time. 

Task 3: (easy) Pack all the pieces into the tray.

Happy puzzling!
Made by Russian designer Vladimir Krasnoukhov.