I am IBS-D so I'm hoping I'm giving you helpful info, but I think another IBS-C could help out more here!
I must say looking at what you ate, the only IF I see is lettuce, hot peppers and spinach. If you weren't feeling too much discomfort/pain with what you ate today then I suggest eating more IF tomorrow, a bit with every meal. Try looking at Heather's cheat sheet and pick some foods from the IF column.
Oat bran is both soluble/insoluble fiber, so I'm not sure if that really counts as IF. You do seem to be getting a good SF base with every meal, so that's good.