Most of the losing runs, in most cases, are due to the fact that jokers with stickers come across too often, I suggest lowering the chance of jokers getting stickers.:
Eternal sticker - 30% → 15%
Perishable sticker - 30% → 20%
Rental sticker - 30% → 15%
I know that many people will write "but this will kill all the complexity," so, I think that this is a bad approach to the complexity of the game, the player should not win 1/100 of the time just because he was unlucky.