Yet another Aeroad sizing question with comparisons

Ahoy there!

Shopping for an aeroad, I am having trouble deciding between a medium and a small. The wizard puts me squarely in the medium, but having two bike comparisons It’s less clear.

I have a long torso, and short legs for my height. (6’0 and like ALMOST 33 in leg length)

I previously had a 54 bmc roadmachine with a 110 stem so the reach was 10mm longer than shown in the screenshot. I rode this for years and felt very comfortable on this bike.

I currently have a medium canyon grail that feels a little too stretched out at times. Sometimes giving a bit of low back pain, Which kind of funny given that it’s my gravel bike.

I do have a lot of mobility in hamstrings and hip flexors… but also clearly my low back also 😂

Anyhow I’m wanting an aeroad for races and triathlons using their gear groove bars. So that position and optimizing that comfort is also on my mind though secondary to typical position on the aeroad.

My assumption is that the medium is still ideal despite these concerns. Is there a reason I should consider otherwise?

Anyhow thanks in advance!