I think one of the issues with transitioning to a vegan diet at least for some people is that in order to feel satiated people tend to eat more refined carb rich foods that arent necessarily balanced, than previously. e.g. eating lots of 'refined' carbs and sweet foods which might cause sugar spikes or imbalances. Its understandable because you're looking for enough fuel and those sources are readily available and tasty.
So it might be worth looking at that? Perhaps a tranistion is to a more whol-istic diet - are you eating enough complex carbs (e.g. whole grain products, seeds, veggies)? and fats etc.
I wonder how useful avoiding things like quinoa etc is, if you are already restricting your diet - I think so long as they're rinsed and cooked should be fine. but I think like Trinity said its feeling what's right individually. I think its possible, but a question of 'asking' intuitively.

Some people also find blue green algae's really useful for the detox. and good quality supplements.
I found it takes some time to transition, for some people years to rebalance, so it might be a more gradual process.