Bonus timing and results beyond prediction
Before you set a bet, know that Free Spins do not arrive on a schedule. How often they start is not known in advance, and the result of one session is random whatever the RTP. The RTP describes what the game returns over a very large number of spins, not what one visit will return. Plan each session on an amount you can afford to lose.
When you read an RTP figure, check which version runs on this site. That detail is shown only in the game rules, so read them before the first spin. A version with a different percentage would change the expected return on every bet.
Before you plan around the top prize, understand what it is. The maximum win of Bigger Bass Splash is a ceiling reached very rarely, and no player can count on reaching it. Read it as the largest possible payout per bet, not as a target.