I don’t know if the OP solved this, but I had some issues where parts with a wide base were lifting off the bed every time.
I noticed on my raft looking closely that the evenness of the bead was not perfect, resulting in less than 100% contact with the bed. I dropped the steps per mm for the extruder by about 1%, and the line smoothed out.
I also re-levelled with a dial indicator and squished the initial layer by a further 0.1mm.
Things seem to be sticking better for now. I’m using blue tape.