I suggested to this board a long time ago already to prefer Ringer Lactate based solution on regular saline.
Like - Dr Grossan's breath-ease.

Also you may be irrigating too much. with your amount of resection I don't know if I would bother to irrigate at all. Yuo have to find out what's best for you. Sesame oil to is always good.
Some here seem to get a good feeling with a tea spoon of Manuka honey (UMF not above 15) diluted in warm saline, although it doesn't seem to help me at all.
Oh, of course - hyaluronic acid based sprays and gels too.
But all of this is written clearly on the website, so you should know it by heart already...

As to the nostrils - of course one compensates for the other, just like during a nasal cycle.