Hi FreshB,

Sorry for the late reply since we saw your question just now.
First of all, thank you for your questions!

Your math is correct in sense, but due to the high interest rate for the first two years, compounding should be taken into account.
In addition, after each mining, the new coinage will be accumulated based on the new balance.

For example:
Blob has 100 tokens, he hold them for the whole first year and mine every 3 days.
Alice has 100 tokens, she hold them for the whole first year and mine every 90 days.

If we use 100% to do the calculation:
Blob will receive 100*((1+100%/365*3)^(365/3)) ≈ 271 POS
Alice will receive 100*((1+100%/365*90)^(365/90)) ≈ 241 POS
You can see that the effective interest rate of first year range from 140% to 170%. The totalSupply will increase to at least 2.4 Mil after the first year, this is bad for the whole system.

But if we use 77% to do the calculation:
Blob will receive 1000*((1+77%/365*3)^(365/3)) ≈ 215 POS
Alice will receive 1000*((1+77%/365*90)^(365/90)) ≈ 200 POS