I haven't shot with the A-1 yet (my used one won't trip the shutter -- took it in for a checkup today) but I have played with it for a couple nights.
I can say the shutter release is more awkward than my AE-1P. The AE-1 is lower, more flush, more intuitive. By comparison the A-1 seems sitting higher, more protruding, requiring a different finger angle to reach up and over then press down (rather than lie flat and press down, as with my AE-1P).
I don't think the shutter itself is the issue so much as the awkward placing of it. Adding that mode switch around it didn't help any!
I would think those raised buttons would be easier to press, but harder to reach up towards with your finger. They would take the awkwardness to a new height (pun intended) when trying to flex the finger downwards to depress it.
Try different hand grips. Try different finger placements. Maybe wrap the hand more around the front and reach the button from another angle? Experiment with the ergomonics of it.