How to keep all snails off the flowers. First there are slow snails.
Now there is only 1 fast snail (2nd from the bottom for me).
Leave that one and slowly from the bottom start pulling to the back do the same for the one above the fast one. Now pull back the first snail, then the new one, then pull a new one. Now repeat, until you get to the top, the top is slightly faster, but just pull the fastest, and as long as you pull it, it will count. This is actually pretty simple and I've gone 20 sec with the fast bar boost at 10x.