You can use JP1 to copy the contents of identical remotes to each other, but as your three remotes are all different, you cannot simply download from one and upload to the next one.

However, if you were to be using JP1, you wouldn't need to be doing all the messing around with key moves and learning that you are currently doing.

A JP1 user would simply create a new setup code that has every button that they need programmed. This is done is a supersonic spreadsheet called keymap-master. Once you have finished entering all the data in the spreadsheet you would then select the 15-1994 remote and copy the code into your 15-1994, you would then change the selected remote to 15-2104 and copy the code to the 15-2104, etc.

Rob