Aston Martin started to have difficulties in Austria. In Canada, during the race, Aston Martin ran very fast almost at the same pace as Verstappen. The change of the front wing arrived in Austria. So that's exactly the problem. The front wing is the most important part of the car, the first point the car encounters the air. Seeing later how the team changed the design several times, it makes me think that that is precisely the problem with amr23.
Teams which have played around with the front wing usually haven't had a good time in this regulation set. If you find something that works for the concept, it's best to leave it alone (minus minor optimizations) and focus on gains elsewhere. Ferrari, RedBull and McLaren never make huge changes to their front wing with their updates. The other team which was messing with "clever" ideas with the front wing this year was Mercedes, with an interesting idea to bring back the "y250" vortex, but with each change they've brought to that front wing they have made it weaker and weaker to the point where it's barely existing as a feature right now. So clearly that didn't work out .