I actually meant to make that "zoom in and out " shot as a really cool way to transition from the boy's room to the big field... but that didn't end up so well...

Perhaps there is a way to remedy this?
Don't use your camera's zoom.
Mount your camera to your tripod, run the "neck" up enough to hold it, screw/clamp it, then collapse & contract all the legs.
Ta-da! Instant freeee steadicam. (Not a perfect steadicam. Only a freeeee one!)
Move in physically rather than zoom in.
If your camera has manual focus or locking focus snap it in at about a yard/meter then
dolly in from focus range to out of focus range. Really run that fat bastard into about five inches out before...
Using that as a transition point to the next shot in the field where you're performing the same action in reverse - physically, rather than with the zoom - dolly out.
When you said "linger on" I think you meant each frame and the story line itself is too slow paste right? and by "new materials" i'm guessing you mean something new to the story line/film right? (ie: "other stuff") I find it quite challenging to put in other filler clips in there since this story happens in a short period of time... and that it seems quite restricting as to what I should put in...
Yes.
("pace", BTW)
No. Not "more story". More of you playing, bassist playing, you guys just staring out the window, sitting outside, picking at something and throwing chips of it in the water, whatever. Something. Nothing. Just dumb stuff that people do while they're figuring out the stuff of life.
Maybe I'm picking up on too much anxiety in the video as is.
Too much anxious "OMG! Should I call?!" "OMG! He called!" "OMG! She answered!" "I don't know what to say!" "I don't know what to say, either!" "Oh, sh!t! Say something!" "Say something!" etc...
Maybe.
So again recapping what "new materials " I have in mind earlier:
1: Vocal singing. Lip dub and other playing
2: Somehow find a way to illustrate how they are different with their "ways"? Let it be ideology, life style and on and on...
3: Show how they will still continue to struggle with their relationship even though they have made the effort to make up... This one is hard because the lyric sequence doesn't support this very well. I'll likely trash it...
1: Yeah, that's fine. Some of the dubbing is a frame off, BTW. It ain't easy to sync I hear. LOL!
2: I'd go the other direction. Less story (not making it "better"!) + more fluff.
3: Nope. Don't do it. You're making a movie at this point and not a music video. Traditionally music videos just "suggest a story".
As an exercise, pick three well made music videos and note the story-to-ftuff ratio.
It's low.