MioKontic: I'm now standing at an average of 59.01 so if all the info is correct I should move to Champion tier shortly.
A few 29s would do it. Of course, it depends on what scores they're replacing. If they're replacing 32s (or equivalent), if I did the calculation correct (which is not guaranteed), 4 29s would do it.
Obviously, if they're replacing higher numbers, you would need fewer.
But you're almost there. Congratulations in advance! 😀