Welcome to the SeeMeCNC Community

So the Raft builds fine, the infill, supports and perimeter all drop down nice, but the 'first layer' always warps. Primarily if it is doing runs of more than 1" long.
ABS filament - Rostock 2 max - prometheus head
- have tried all sorts of temps from 220 to 240
- tried bed temps from 70-90
- sped up the head, slowed it down
- increased & decreased flow
- increased and decreased first layer height
- tried printing with and without raft
- used other ABS filaments
None of this seems to make a difference on that first layer
I am fresh out of patience and ideas.
Hoping someone here has some insight.

Thanks
James

Your bed is too cold. Kick it up in 10C increments and see what happens. I print mine at 110C. Hotend at 220C. Zen Toolworks White ABS.

You could also use an enclosure. I replied to your other post so take a look at it.