Clan Wars: guarantee Small Earth in every time slot
Small Earth 1 wasteland, Small Earth Auto Dist, or Small Earth Commanders and Bomb Card should be in every time slot.
Right now it's possible for the following time slots to occur:
MME Commanders LD No Cards by itself
MME Commanders LD No Cards, MA MME Light Fog LD, and Strat 2v2
So even a 3-template slot could have templates that are unpopular and non-viable (the MME LD templates due to how incredibly long they take, Strat 2v2 because it's infeasible for most clans to have 2 players on CW at once willing to play that template and also because it takes ages too). Meanwhile, SE templates- particularly SE1W and SEAD, but also COMBOMB when neither of the other two is available- are overwhelmingly popular and drive up participation in a slot. They're the most popular templates among casual players, quick, and well-suited to RT play.
Many participants do not have the luxury of checking multiple slots a day. If SE were guaranteed in every slot- then the vast majority of players would have at least one template per slot that would actually make Clan Wars enjoyable for them.
As a stretch goal: put Beren in charge of template selection for CW, Arena, and the fixed QM templates (sorry for volunteering you without asking, Beren). He'd probably do a great job.