It’s rolling along pretty good before it goes to wot....... which should make the converter look like it has more stall on the sheet than it would “on the starting line”.

Looks like it’s at full power/load for about 4 seconds.
I’ve watched several times now...... you can hear the rpm hover a bit after it gets up on the converter, then start to accelerate afterward.
That point right before you hear the pitch start to change......that should be where the spike on the sheet is.

On an engine dyno, a 3000-6000 pull at 300rpm/sec rate would be ten seconds.

The motor sounds pretty good.
As long as nothing seems “broken”, I’d def head to the track before I changed anything.