I believe there is one thing OP can do to incentivize people to continue re-investing during the round.
Currently, he starts the payouts approximately 15-20 mins after the first deposit. This means people have already deposited 70 BTC, and the people who are paid out do not want to re-invest as there is already 70 BTC.
BUT, if the payments were instant like the Fees this might change. OP is instantly transferring the fees to his fee address, but payouts wait 20 mins. Making the payments also instant would give people who are paid to reinvest and therefore the active duration of the round would be much longer.
Just a thought...
What happens and that due to the absurd number of deposits in the first 5 seconds just catching the script and he often has to manually do all of them.
The problem is that we only see some whales pouring with bots at the beginning of the round. Even if the payments are instant they're going to not reinvest that won. This and the problem 24 hours, the weekly had 2 to 3 days volume of deposits and the chance to win something all.
While insisting to continue maintaining the 24 hours and it's going to happen and I can say that soon the volume will increasingly diminish, because if your deposit delay 4 seconds possibly you will not receive anything, and are just wasting money in this game.