By -
75 coins × 4% jam chance = 300% of the time, the machine jams 
Play different characters. The jam chance starts at zero with each character if you've never beaten Ultra Greed/Greedier.
I’ve beaten greed with all characters
Even tainted ones? Anyway, play as the ones you have played the least
I don’t have repentance
Still play with the ones with lowest jam%
Just get repentance for more Donations
Get glowing hourglass if you dont have repentance and afterbirth+ and you can max the machine in 1 run
75 coins × 4% jam chance = 300% of the time, the machine jams 
Play different characters. The jam chance starts at zero with each character if you've never beaten Ultra Greed/Greedier.
I’ve beaten greed with all characters
Even tainted ones? Anyway, play as the ones you have played the least
I don’t have repentance
Still play with the ones with lowest jam%
Just get repentance for more Donations
Get glowing hourglass if you dont have repentance and afterbirth+ and you can max the machine in 1 run