wanted to chime in here as well!
most of the issue here stems from 2v2 being the best way to get max cards on collection day, because it isn't 'gimmicky' like wallbreaker rush etc and is more 'true/skillbased'.
me and seth talked last night about adding a 1v1 tournament standard/ladder level mode to collection day to combat this.
it's become increasingly clear from feedback that it isn't the 2v2 game mode itself which is missed by pro clans, but rather the chance to win a more 'true' skill-based match and therefore maximise your collection day cards. (of course there is also those that just play 2v2 because they actually like it)
we will talk more with the team on monday but if we feel this is a good solution then it will go in on tuesday alongside the balance update.