The easiest way is to search for the value, surrender, battle again, and then search again.
1. If its x-150, search for 150 and get a lot of addresses
2. Click surrender. * this uses up a sword but its the safest method of finding the correct address
3. Battle again. Refine your previous search with the new upper limit from the same difficulty. So if it was x-150 before and now its y-148, search for 148.
4. As long as you dont close the game, the address should remain the same. It's easiest to just do your 7 streak at once.
If you get two numbers then one number is the the score and the 2nd number is the score if you have one of the bonus units. The 2nd number is the one that is sent. It will be 2x the first number if you have a bonus unit and the same if you dont.
Also since stats don't matter anymore, either do 7x beginner matches or use a team of 1 or 2 lvl40 + lvl 1 dancer/singer.
Edit: Oh and it seems like losing units makes a score a percentage of your max. So if you set your score to 1000 but lose a unit, the game will send a score of like ~900 or something like that.