Voting percentages to keep steem account voting power between 80 and 90 percent

Out of curiosity, I thought I'd look at what voting percentages to use to maintain a stable account voting power balance. According to my handy dandy LibreOffice spread sheet, here are some rule-of-thumb numbers to keep one's voting power in the 80-90% range.

Assumptions:

1. Each 100% vote drains 2% of your remaining voting power.
2. Voting power replenishes at a continuous rate of 20% per day.
3. My hacked-up formulas accurately represent assumptions 1 & 2.
4. Votes are evenly distributed over time (not very likely!)

Update: To extend the rule of thumb: looking at the curve-fit formula from LibreOffice today, instead of the playing with the graphs, that curve can be closely approximated with the simplified formula:

Percentage = 50 / votes_per_hour.

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1 vote every 2 hours: Vote with 100% voting power

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1 vote every hour: Vote with 51% voting power

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2 votes every hour: Vote with 25% voting power

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3 votes every hour: Vote with 17% voting power

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4 votes every hour: Vote with 13% voting power

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5 votes every hour: Vote with 10% voting power

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6 votes every hour: Vote with 8% voting power

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7 votes every hour: Vote with 7% voting power

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8 votes every hour: Vote with 6% voting power

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Here are the (integer) percentages to keep voting power as low as possible in the 80-90% range from 1 to 23 votes per hour and the fitted curve that LibreOffice found from them.