You could try using courses that uses sentences instead of words? Or skip to more advanced courses, as Hydroptere said.
Kit_libz if you want to be able to use verbs at speed then try https://conjuguemos.com/
Most of your complaints seem to be because you are not familiar with memrise yet, you will figure out ways to get what you want.
Duolingo is losing about 50,000 dollars every single day, Memrise is starting to break even, so whoever valued Duo had no idea what they were talking about, or your information is grossly out of date.
Anyway, Anki has the exact option you are looking for, if that helps.
Things specific to Spanish:
Pienso QUE… you can’t omit relative pronouns in Spanish
You’re lucky to be learning Spanish, it has the most free resources of any language save English. Here are my favorites: https://sites.google.com/site/learnspanishdirectory1/
It’s funny that you would spend 150 hours on duolingo and talk about efficiency! It is sooooooooooooooo slow. Its advantage is it is fun and has a good interface, but it takes so long just to get to A2 with it.