Rather than buffing the boon meta even more to open up spots on teams (that will only be filled with DPS spots anyway), why not nerf the current boon meta so that boon builds become a choice, rather than a mandate?
Alacrity: 25% instead of 33%
Frost Spirit: 50% chance to give 5% bonus
Grace of the Land: 1% damage bonus, 1% condition bonus, 5 stack max, 12s duration
Might: 25 or 20 power instead of 30
Quickness: 33% or 25% instead of 50%
Sun Spirit: 50% chance to apply 2 stacks of burning
Hit Spotter, Empower Allies, and similar abilities with a drop from 150 to 100 (150 for assassin’s presence). Drop banners to +100, too. All of that works with lower DPS on boonbots to make them a choice, not a mandate, and hopefully open up the meta.