I would like to share some of my thoughts.
Though the 90% rule is good enough for beginner and intermediate learners, I would like to add that, very likely, it would be insufficient for more advanced learners. (I'm not a native English speaker, so I understand the problem from their side perfectly.)
If your students are willing to remember grammar rules, then you are lucky, especially if your students are not those who their first languages have virtually no tense. If I understand it correctly, most Asian languages have no such thing. The tense is implied, not used explicitly as in English, which is why many Asian people find it so difficult to learn English. (Not to mention many other problems such as articles, phrasal verbs, propositions, and so on.)
One good cure is use the language (in this case, English) a lot. Much enough that the learners can reach some level of sense of the second language (L2). Unfortunately, this is easier said than done.
The next best thing, in my opinion, is to give some simple examples as the exemplars that they can rely on. So they can compare these example patterns to the grammatical problem they face.
Good exemplars should be simple enough, and yet still contradict the sense of first languages (L1) enough, to the point that they can realize the difference between the L1 and L2. A good exemplar for the use of gerund vs. infinitive that you mentioned, according to my own experience (myself and those who are close to me enough that I can help them), is:
I stop thinking.
I stop to think.
If they understand the profound difference between the two, they will develop the sense that helps them understand that which one is preferred, in which context. With such "language sense", they will be in much better position to deal with even difficult cases. They might not do it right the first time every time, but they will find the problem very easy to understand once being corrected.
Hope this is helpful.