My saddle is VERY uncomfortable
Agree with what's written above, but further, if the known saddle is very uncomfortable, I'd risk a brand new saddle on the off-chance, even untried. It's unlikely to be worse.
Just FYI, I had a well broken in Brooks on my folder which is very upright, and put it on my road bike. I rode 57km the day I changed it, and did a 200km ride a few days later, without a problem.
OK, one problem - I didn't tighten the bolt enough, and 150km into the ride, the nose of the saddle shot up in the air. Ouch! So tighten all the bolts.