Would your exit metric make money on random entries?
If you get almost to "target" then get stopped are you just trading "noise" as opposed to appreciable moves?
Ask yourself why you are focused on a target, then why, this specific target?
If you consider this "target" construct as a minimum requirement to affirm trade entry would you be taking fewer trades?
Don't be offended, but this target talk and ratio talk, while it is valid in the context or automation, does seem like it is unnaturally limiting and rather academic as opposed to practical.
Is the source of that notion a prolific and consistent trader or a "teacher" or author?
I'm not saying that is a bad approach, rather an approach that you might want to pass through.
If I overstep, I'm fine to back it off. I want to ask questions that move you toward pressing the hell out of winners. Perhaps the single most difficult technique to get comfortable with.
Exit when the conditions that validated entry are no longer present?