RTP is a long-run model
A published return-to-player figure does not predict one session or guarantee a return. Confirm the figure for the exact version and understand that short-term results can vary widely.
Volatility shapes the ride
Higher volatility generally means returns can be less frequent and more uneven. Compare this characteristic with your fixed budget rather than interpreting it as better winning potential.
Features can increase total stake
Bonus buys, multiple lines and rapid-play settings can change the amount exposed per round or per minute. Check the final stake display before every change.