I'm late to this, but it's absolutely possible to spend way less, even with your medically necessary restrictions. We've averaged $628/mo for groceries and eating out over the past year. We live in the same general area as you. That's for 2 adults, a 9yo and an 11yo.
The youngest is dairy intolerant and for a couple years was also egg intolerant. We also went through a period 2.5 years ago where we did several different elimination diets with her over several months to figure out what was making her so sick. At one point she was off dairy, egg, gluten/wheat, oat, sesame and soy. Even then (and that was without paying any attention to cost because the restrictions alone made me crazy) my highest spending was only $800/mo. My kids refuse to eat beans (I've tried and tried) so it could be even lower if we didn't eat so much meat.
Your devotion to specific brands, organic, and tons of meat is costing you. It's up to you and your wife to decide if it's worth it.
Some tips that may help:
1. Buy your groceries online. Almost all stores offer either delivery or curbside pickup now. It's ridiculously easy to comparison shop, stick to loss leaders and only buy the amount you need online. Plus it's way harder to succumb to "stuff that looks good, but we don't actually need" online. You could shop online yourself and save your wife the hassle of doing it.
2. When you shop in person at Superstore, look at the price labels on the shelf. Every single one of them includes the per unit cost, so you don't even have to do the math. Just pick the brand/size with the lower unit cost.
In this example, the item is 450g of barley that's $0.331 per 100g. The egg section is labeled the same way ;-)
Someone correct me if I'm wrong, but I thought Canadian farmers weren't allowed to use hormones in their animals? It's one of the reasons meat, eggs and dairy is more expensive here than in the US. If so, buying organic is less important here than elsewhere.