Do you have any suggestions for amount of actions per turn or total deck size if attempting this with 8-10 people?
um, I don't! in phases 2 & 3 I'd say that's too many players for it to work correctly. If you're just doing phase 1, a 10 people could do 2 actions each and have a deck of 20 cards, for 8 people do 3 actions each and you'd yield a 24 card deck. In all versions, each player will have the cards-in-hand at least two times to get a Label and Art on every card.
so basically (number of players) x (number of actions) x 2 = (total cards in deck), and your deck should be in the 20 card range for phases 2 & 3 to be cool!