If you're asking why your last payout was 2 days ago, it's because you don't have enough payable balance for a daily payout, which is minimum 0.01 BTC. There is also a weekly payout for all balances above 0.001 and it runs on Sundays.
Noticed last sunday, that I got a 0.00x payout, but I was mining, there was no need for that payout, as it would be 0.01 later.
Perhaps something you need to look into? (or?)
Oh, I am not going to try to predict wether particular user will continue mining for long enough to have 0.01 BTC balance tomorrow or not. And then read complaints of users who expected to be paid 0.004 BTC but were not.
The 0.001+ BTC payout is scheduled 2 minutes after 0.01+ BTC payout, so anyone who had at least 0.01 BTC is already paid and the 0.001+ BTC payout includes only users who didn't earn 0.01 BTC during the entire week (since previous 0.001+ BTC payout). I don't think there's need to optimize it further.