Captions display late - past edit point. Caption instructions?

Stan,

I'm manually creating the captions from inside Adobe Premiere, one at a time.  I'm about half done.  I can set the caption in and out points, but when I scrub the timeline, or play the program, the captions don't appear at the edit point, but later. Thanks for the link to Switch. Before I try that, I exported a section of the project with the captions burned in.  The exported file was consistent with the timeline, with the captions appearing a few frames after the caption edit point.  Not noticeable on sections where there's enough of a pause between words where the caption breaks, and just a minor delay on the others.  So it's not a huge problem. Just want to make the project as good as it can be.  I'm making the caption break right on the end of the last word in each caption, which minimizes or eliminates the delay.

How will the video and sidecar files be synched during playback?  I notice when I view an exported XML file as a text document, the first caption shows as beginning at "00:16:21" so I assume that tells the player how to synch the two files. Is that right? 

The premiere proj file I'm captioning is complex with lots of layers -- and kept crashing as I added captions, so I exported an mp4 file, created a new project and am captioning that with no crashes.  When I export an XML file from the new proj and import it into the original program, I need to manually synch up the start point of the first caption.  When I'm importing a subtitle sidecar file, do I need to be concerned about the captions import settings?  For example, it's a 1080p project, so I set have the import settings panel set to CEA-708, 27.97 fps Drop Frame (which matches the project) and the pixel aspect ratio to HD Anamorphic 1080 (1.333). I've also set the alignment setting to "wide screen."  Any input on import settings? 

Thanks.