Hey Birdseye, yep, you can actually customize this :-)
See these rows?
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% earning 5X points
% earning 3X points
% earning 2X points
% earning 1X points
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You can edit the numbers next to them, saying, for instance, that of your spend, 0% is at 5X, 15% is at 3X, 20% is at 2X and 75% is at 1X. The rewards amounts will then update in real time to reflect that new ratio