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I'd try raising the temp on the heat bed and maybe on the extrusion for the first layer.
The bed arcs up in the middle when it heats, so it may also be an issue with z offset. If it is 0.35 in the middle, but 0.45 at the edge, you might just need to smoosh the first layer more. Speed also effects first layer, so slowing down sometimes helps.
Find a big flat one layer test print and see what helps. Just don't doal bunch of changes at once.
Decrease part cooling. Especially for small prints, when the fan kicks in it can cause sudden cooling of the top part while the bottom stays hot, causing warping. Bed adhesion is a separate issue, in that case the bottom layer should still be flat.
My PETG profile has no cooling for the first 2 layers, then gradual ramp-up until layer 5
Petg is really sensitive on bed adhesion. Make sure after cleaning the plate only touch the edges. If you touch anywhere in the middle that leaves enough oil to make bed adhesion an issue. I clean my plate with rubbing alcohol mix. And found out after many print failures -no touchy!
100% this, bed cleanliness is the first thing I'd look at for any adhesion issue. Dilute soap and water works well too, just pay attention to your surface, some don't like any solvents or water, just a wipe with micro fibre.
Petg also likes an enclosure, temperature variance of the room likes to cause warp too. Geometry could be an issue.
1st thought is bed adhesion. Clean better? 2nd thought is filament parameters. Whose PETG filament are you using? Bambu's default are for their filament, yours may be different. 3rd, cooling at the edges, the A1 has no box around, IIRC. Can you make a DIY cover to hold the heat in or raise the room temperature or avoid cool drafts.
Post pics?
@KingDingbat I don’t have PETG experience but I recently printed with ASA for the first time and it came away from the plate at the edges.
Washing the plate helped but only Glue stopped the issue entirely.
3 failures before I glued, zero problems after Glue.
Do you have a smooth plate? Try glue and a smooth if you can. Also can still use glue on the texture plate too. Recommend one of the fancy 3d printing glue sticks over repurposing some random gluestick. Also try "mouse ears" little circles around the corners. Some slices have this as option but you can build them manually too. Search mouse ears and your slicer for instructions.