I haven´t played a lot either, but my humble opinion is combine the toad lilys and water lilys, at this moment everything is doable with 3* evolved girls or more, so no need to put toad lily ability so high, same with edelweiss like someone said in another post complaining that she was absolutely neccesary, and who to feed your ampys you should decide which girl you like the most, if you really wanna boost your 6* then choose the one you prefer (cattleya or peach) in your own terms, wether is by stats, skill or just the better looking one.