I think I follow your idea Josh and I think it's brilliant. Though we had 23 completed cars, can't forget Kurt and Ron they didn't end up on the green list. So it would need to be 3 groups of 5 and 2 groups to 4 to level out.
I just got through setting up a test poll and it does not require 5 options per question so your idea will work perfectly. If that's alright with everyone else it seems like the fairest option we have for voting using the poll this year.
Example
20% 20% 20% 25% 25%
Group A Group B Group C Group D Group E
Car 1 Car 6 Car 11 Car 16 Car 20
Car 2 Car 7 Car 12 Car 17 Car 21
Car 3 Car 8 Car 13 Car 18 Car 22
Car 4 Car 9 Car 14 Car 19 Car 23
Car 5 Car 10 Car 15
Is that about what you had in mind Josh?