That is indeed a problem. When I read the orange nuance hint I can tell the answer in most cases without reading the sentence.
I always start with hidden translation and hint so that I can read the sentence without any hints. But the orange nuance hint also shows when “review english” is set to “hide”. So I can even tell the answer without seeing the yellow hint or reading the sentence.
Maybe you should hide the orange nuance hint as well when users set “review english” ton"hide".
On the other hand the nuance hint is necessary because there are just way too many similar grammar points.
One solution could be: just show the nuance hint when the user uses a similar grammar point as his answer to guide him to the right grammar point.
Another way would be that you (Bunpro) try to define any possible alternative answer for each sentence and if the user types in one of these alternative answers you show ‘not looking for …’.
As for now, there are still lots of sentences where similar grammar is not added as alternative answer.