well yes, it's going to uncomfortable, but this is something else.

I've been having this issue where after about 30 min at threshold levels (on the TT bike) I get this dull ache, bordering on numbness that starts at the sit bones and goes down my leg. Mostly on the left but to a certain extent on the right. It's really unpleasant when it happens.

It doesn't happen in shorter TTs (20km), and doesn't happen (on longer rides) if riding sub-threshold.

I had a similar issue maybe 4-5 years ago, but it seemed to work itself out. Mainly it would happen after the turnaround in a TT when I would get off the saddle then sit back down again.

My position has changed a bit since then, as a consequence of injury (long story).

Using Adamo saddle (for a long time now)

Wondering if others may have had this issue, and if so what did you do. My first inclination is to try pushing the saddle back a bit and sitting more on the nose. (I do have the logo showing now, as they recommend, but feel like I still could be a bit more on the nose)

Next would perhaps try saddle height (I think I am set up pretty well there, but might try a touch lower)