Isn't it like if you open your wallet and make stake, you will get like very small amount for every hours, but if you open only 1time in a week, you will get bigger chunk because all stakes adding up for those days into 1big, so it's optical illusion to someone who are getting "small" stakes even that they both are the same.
not really minimum time to stake is 24 hours so after 24 hours shouldn't you get (amount of mature coins*5)/365 as a minimum