right answers don't count
When I practice weakest words without timer I need to answer 20 questions with 4 hearts. If I have 14 right answers but run out of hearts I don't get a confirmation of "you have strengthened 14 words". Which is not fair I believe. If I want to make my right answers count I need to do timed practice, but there I don't have time to study the right answer if I make a mistake, because the timer don't stop as we all know. Please fix it.
I feel your pain. I have started looking at all the weak words and pick out individual ones to practice, and I only have between 2- 8 questions at a time. Then I go to another weak word and practice it. If a word has many forms, you can't pick out the ones that are weak, as you have to practice all the forms of that weak word.
One thing you should know is that when you practice one word at a time, you most likely will run into words and grammar that you have not studied on DL. I have run into future tense, imperfect etc. These words are covered in other sections, but DO show up on your vocabulary list. At first it annoyed me, but now I just take in stride and keep on going. With each word you sort of get in a loop. After you push continue a couple of times, the program leads you back to the same word again. I hit my back arrow a couple of times or simply go to the vocabulary tab and look for more weak words.