I'm happy with your progress. I myself am loosening my diet restrictions, starting from a couple days before the end of my Disney cruise.
Certainly, I have been more cautious than you are, and the others who have shared their experience, confirming that the diet was only during radiation treatment -- not necessarily before & after as some pharmacists or oncologists may advise. That said, I learned to like/enjoy bland foods when I avoided fried &/or spicy foods, caffeine/carbonated drinks for a couple weeks before & almost four weeks post-radiation. (No harm done, but I wouldn't say mine or my pharmacist & oncologist's approach was the right or best one.)