Dear Mitzo,
I have not read the compete thread but I have another discussion happening here called FODMAPS. Please take your time to read through it. I too have UC and got it after quitting smoking. I have recently had a consultation with a dietitican who deals in research with people with Crohn's and colitis. Please read my thread it may very well help with the gas and mucous problem and maybe with any bleeding. The diet has really turned my disease around. No more wind, bloating, gas or bleeding for me. I aim to stick to the diet. Please read about it in my thread. The dietitican told me that my disease would improve 75% and it turns out that I have improved. Thank God. Here is the link.
https://www.healingwell.com/community/default.aspx?f=38&m=998680
Also here is the link to the research about the diet
http://www.healthsystem.virginia.edu/internet/digestive-health/nutrition/BarrettArticle.pdf