The game is, besides the interesting look and ridiculous voice work, super f'ing volatile. So rather than guess 750x or 1250x which are very possible on any of the three modes, I will take the Price is Right approach:
Sticky Mystery : 2x
Stacked Wilds : 1.5x
Coin Collection: 7x
Hope whichever decides to go red for you goes to the moon, Will.