Sometimes the way to adjust the depth is increase the distance to the subject a little. That can get you a bit more depth at the subject and still make for sweet bokeh. or just mask and soften everything behind the subject. not a bad method at all really, with all due respect to the learning experience of doing everything you can in camera. Question-Why portrait instead of landscape?

Oh and sometimes the flower itself is the problem. Misshapen petals like one aimed at you and one backward instead of smoothly arrayed an issue seen in #5. Just my thinking, but instead of B&W a warming filter might have brought a kinder color to #3. Not that the B&W is a bad way to go at all though!