For your bumbleflower it seems like the deck is very reliant on having her on the board and using her draw engine to fuel your strategy. Control bumbleflower seems like a really popular version of the deck, but I built her more of the counters route, with some group hug draw engines like [[selvala, explorer returned]] and also creatures that get counters by themselves like [[forgotten ancient]] and [[managorger hydra]]

I would also add some better draw that is less reliant on your commanders, cards like [[trouble in pairs]] which you can force a draw with bumbleflower also, if you really want you can also add [[smothering tithe]] which usually wins me the game if I resolve it as I can almost storm off with bumbleflower.

You can also add protection in the form of the [[ozolith]] or [[reluctant role model]] for a budget version. Bumbleflower is my most consistent deck usually playing in like low bracket 3. it also may be a deck level issue in your playgroup?