I initially suffered from blocked nasal passages but when I moved on to the Resmed S9, used the EPR setting and just a bit of heat through the hose (26C) most of this vanished. That said I live in Queensland where the humidity averages 75% and gets higher in summer. I found that if one nostril was a bit blocked the other one gave me enough air to carry on. On the odd occasion when both started to block, a quick rinse with a nasal solution and 30 minutes later I was ready to sleep again. That said, I haven't had to do this for a while now so maybe my nasal passages have adjusted.
Keep at it, hopefully things will improve by themselves like they did for me. I think it's important to use a nasal rinse only as a last resort so that your nose does learn to adjust.
I was able to use my APAP for 2 hours last night, but my AHI was a 14. I guess that's better than my baseline 50. When it did get to higher pressure settings, hit 9.8cmH2O max, it was easier to breath through the mask. This being said that sure did seem like a metric butt load of pressure to me! So far I seem to go a bit longer each night. Tonight I am shooting for 3 hours min. I did cheat with the congestion and took a Mucinex, but will try to avoid doing so as I do not want to become dependent on it.
Thanks to all for the suggestions so far!
I recommend a nasal rinse for bad nasal blockage and a saline based nasal spray like Xlear for other blockage. Xlear is saline with xylitol and works great for me. Daria recommended it and I love her for it.