It's not like your effective dividends will converge to 6.5% over time. If you buy
100@1.02, you earn 6.5BTC the first week which is a 6.37% return, and that doesn't change. It's not like it will start out lower and over time approach 6.5%.
Indeed...
In the scheme of things, to get 0.065BTC every week for 1 bitcoin or 1.02 doesn't really impact the profit loss much at least in my books.
2483;2533;2643 is massive and I will live with the difference happily.
You have a much higher chance of losing bitcoins for other reasons

and Pareto would suggest to focus on those aspects with the biggest potential.
This is way way too minute in my opinion.