A whole plethora of better options in Taiwan

There are plenty of other companies with healthier work environments, more postive feedback, fairer pay, and a guaranteed offer after the first interview. In addition, look for all of the other options where you won't have to work six days a week like you do with Hess. Even with your good work ethic, their work week isn't as practical as you may initially think (For instance, if you travel somewhere else on the island, you have the added anxiety of having to make it back within the day to start your work week [that just concluded]). Finally, keep in mind that you might be grading on your one day off.