Half-Sphere Print Turns Into Pasta During Bottom Layers

I’m trying to print this half-sphere (Earth), but the bottom layers always turn into spaghetti. I’ve printed other models since without issue, so it seems specific to this one.

I’ve tried printing it flat and at a slight angle—both fail. I’ve also tried 0.08 mm and 0.12 mm layer heights and don’t want to go any higher.

Does anyone know why this is happening or how to fix it? Maybe a better orientation or some tweak to the print settings?

Printer Settings:

Bambu Lab A1, Bambu Studio, Bambu Lab PLA basic White filament, Nozzle temp: 240 c, Heatbed Temp: 65 c, initial layer: 15 mm/s, initial layer infill: 105 mm/s, outer wall: 60 mm/s, inner wall 150 mm/s, retraction length: .8mm.