If you modify a job queue, you would have to re-apply that queue to your grids because the queue information is stored in the grid (to make the grid files portable without having to have the original queue created/existing on the server instance of BP- this was a tradeoff decision we made at design time). That said, we do realize this is not a good user experience, and we have plans for improvement.
As a workaround for now you can re-apply it to just a single grid to start. Then save the bps file for that single grid and open it in a text editor and find the change/update that you made. Then you could use the text editor to find/replace across all of your 53 files. Just make sure to test it because if you introduce an extra space or line break or somehow modify the format etc so that BP can’t understand/read it, it won’t work. And needless to say you’ll want to make a backup of your bps files before modifying them like this.