The 1.65 boost is significant because Daisy's DUGS! skill is already a whopping 30% at level 1. Which boosts it up to 49.5%.

Now, combined with Cymbidium, she should be using DUGS! first turn every time.

Dendrobium needs to have her skill at level 2 to pull that off (level 1 = 24% * Cymbidium's 2x boost * her own 2x boost = 96%; level 2 boosts her to 26%).