Cadance should be the February model.
Which probably leads to switching Rarity and Twilight in sequence to underline the cycle of Princesses. Besides - long winter evenings, too cold to go outside, lying in cozy bed with a book of choice... Thematically goes better than spending a June day on nerding out inside the house instead of doing so outside; all while June Rarity would serve as a nice complement/juxtaposition with May AJ.
*fixes monocle* Quite.

Base +15, l4chuga +7

Luna should be October. Their Halloween equivalent was invented because of her.

Base +7