Taiwan theatre is now included in Tacview 1.8.7 beta 3: https://tacview.net/download/beta/
Below is the declaration I made which is almost identical to yours.
It’s just impossible to get it perfect, as oakdesign explained.
Time Zone is 0 because no time zone correction seems to be needed on this theatre.
<lod>2</lod>
<west>114.93</west>
<east>125.05</east>
<south>20.4</south>
<north>29.61</north>
<visible>1</visible>
<timezone>+0</timezone>