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Hello, sorry for the delay in responding! In fact, the amount you delegate does not influence the APR, as they have now implemented 3 levels of delegation:

When you delegate any value it is 13% APR, in this case you receive liquid LEO tokens, if you decide to choose to receive directly in your stake, it increases another 7% and goes to 20%, if you are premium you get another 2%, going to 22%

I made a post explaining this very briefly, but it's easy to understand:

https://inleo.io/@shiftrox/enptbr-lpud-and-delegation-levels-go-premium-go-higher

If you have any questions, you can ask me!