I say power all the way up and decrease the percent range by half (~1-2.5%). This should give roughly the same payout and will give you twice as many daily votes so you don't drain as fast. When you get to 75~80% you can rest for a day and start over.
Your average vote weight now is 3.5% so you can vote ~571 times a day without losing any voting power. If this average weight is dropped to 1.75% you can vote ~1143 times a day without losing any voting power. That would allow you to vote once every 1.26 minutes. And that would be just for randowhale. If you include randowhale1, etc you might never have to rest. Or you could combine the accounts and greatly reduce the voting weight into fractions of a percent.
This is assuming I am thinking about this correctly and my math was right.