I am your size.
I had both xc in 2 & 3 at the same time.
Ultimately I stuck with the 3 as i like to sit more than I lean and the 3 had more scoop in the butt and just a tense less hip pressure.
Neither is particularly awesome for walking in as they bunch in the lower ass. However, if I leave the leg straps loose when walking and just let them hang naturally then I don't even know its on really. So, if I was a more of leaner than sitter then I'd opt for the 2 as it was comfortable also.
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