Well I don't know what to tell you guys because obviously i've been playing the game since the release and before the update. I think that may explain why some of us here got past the orders you guys were in and able to get 3*s. What I may suggest is to train your pokemon up to level 15 as much as possible or around 10~15 to be more sufficient enough. If you got enough kitchen notes, make use of them.
It's true that gummies are annoying to deal with. A Level 15 wobbuffet, a bellossom, minun, stoutland, gogoat, chimchar, and pichu can clear the gummies out. now if it were to be pumpkins to be dealing with, you have to align your cafe skills and megaphones within range of the gimmicks.
Any orders that requires megaphones to clear, use celebi depending on their specialty if you have them.
If i knew what order you guys were stuck in, i would've looked into them and see how i able to clear it with 3 stars.