How is it supposed to feel....

You are talking about precious metal clay not polymer clay right? You can't bake precious metal clay in a regular oven, you have to have much higher temps to release the impurities out of it and set it. You can also use a blow torch. If you are talking polymer, I would consider using somewhat longer time in the oven, the higher heat could "burn" the plastics in it.

I do know there is a change in the baking time/temp but off the top of my head I don't remember what it is. I will tell you this much - I am not at high altitude when you first pull a piece out of the oven it is soft. It hardens as it cools. I went and checked on the temp difference for you.... 300F for 30 minutes per 1/4 inch of thickness.

Polymer clay is soft when it comes out but hardens as it cools. If you put it in ice water it hardens fast and clarifies translucent clay better. I use mostly translucent clay and mix my inclusions in for color so i ice water almost everything. If you make something that needs cutting right out of oven like tube beads then don't ice until after it is cut.

When I bake polymer clay at 700 feet above sea level (midwest), it is still soft when I remove it from the oven but it hardens as it cools. I've had trouble with overbaking sculpey, though. It gets brown and brittle when you overbake it. I don't think that you need to adjust the time or temp for elevation. Adjust the time for thickness, however, according to the directions.