my bankroll is BTC 0.00510406
-snip-
but my bets are usually only
BTC 0.0001
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Just wondering is this your declared bankroll for the competition? If you bets mostly with 0.0001 btc then declare a smaller bankroll. Only 5% max of your bankroll will be counted for the ROI so in your case 0.0001 btc is only like 2% of your bankroll. So in case if you win, you will get full ROI count from your bet
I sort of like to bet with big amounts and I am considering entering with big bank or smaller bank and basically doubling the amounts of tickets I make.
Yep go with the smallest bankroll possible. The point of this competition is to get the highest ROI from your bankroll not to get the highest profit margin from your bankroll so whatever amount doesnt matter at all as long as you keep on winning and increasing your ROI count . Just make sure that it is within your budget though