Jiao and he are both hanging needles, and words such as doubt, worry, skill and wood should be written as hanging needles.
Say a word "bell", Yan, Liu and Zhao are all written as garters, but as hanging dew.
So we summed it up as an unwritten law: anyone who can use an infusion needle can use an infusion needle, and those who can use an infusion needle may not be able to use an infusion needle. Specifically, it depends on the copybooks of famous regular script writers, and must look at the ancient ones.
Let's make some sense: China's calligraphy emphasizes "no sagging, no shrinking, no closing." Intention is implicit, and sharpness should be based on implication.
Furthermore, you should not always try to find a rule or formula. For many questions similar to those you asked, especially some rules about word formation, you can describe them as "under normal circumstances, you can never sum up an individual", so I suggest reading more copybooks and summarizing them in words.