I didn't do a balance transfer at all, and I got an immediate jump from scorewatch within two days of it hitting EQ. No other changes at that time. And it was a Juniper/Barclys card
Of course, when I got my credit report recently EQ was really upset that I had got new credit without a hard pull from them

They seemed annoyed that it had increased my score by 10 points
For the previous new card they gave me 10 point bump and no nasty comments about new credit because the hard pull was from them, and they could complain about that

The slide from grace is really more like gliding
And I've found the trick is not to stop the sliding
But to find a graceful way of staying slid