Agreed. When I test rode the medium, the Giant store swapped the stem for a 110 mm. And I knew I needed a 115 to match the TCR I then had. I took it racing 😈 . Then when I bought it, they put on a 115 for free.
Now I’m a little more flexible, nothing special, and my reach on both bikes has grown 5mm. But I can still ride on the drops for long periods at a time.
Test ride is the best answer. You’ve ridden a long way, now ask for a longer stem and see how you feel.
Btw I raced the Defy for a season of masters circuit races and still race it on the potholes of surrey for the smooth ride and light weight. I race the Propel for all other races. They are different, but if I had to have just one, it would be the Defy. A bit like choosing HT vs short travel FS. Nice not to have to choose.