The power up in Wizard Pinball isn't determined by RNG, it's by the number of seconds left. If it is odd, then you get extra balls, but if it's even, then you get a bigger paddle. Courtosey of Jackzfiml for finding this out on October 19, 2021 before 10:08 PM EDT.

jackzfiml edit: Changed the guide name as this isn't really a strat, rather this guide is explaining how a game mechanic works.