"i have heard of people feeding their monitors dog food, and i guess some people have also been successful in keeping their monitors healthy with it"
It depends on the individuals definition of sucess. If sucess is keeping them alive their whole life you could say that when they die in 6 months to a few years at a young age, thats true its after all their whole life. Medium to large species of monitors fed insects, rodents, and birds their whole life live a whole lot longer, mainly consider the rodent as the best part of their diet. Its also a whole set of conditions starting with a proper environment with access to choices of temperatures, humidities, fresh clean water, plenty of food for growth and reproduction if that is permitted by access to mates, and lots of space to grow, get away from each other etc. Its not any little one ingredient but a some of the whole, many aspects that you have to understand the biology of the animal.
Dog food, cat food, the name says it all, why consider it? Because a book says you can do it, no, been there tried it and saw even short term differences with whole animals only. Why complicate something when you have so much more to learn about the whole picture. Stick to a proven diet, no one has real sucess with dogfood, or catfood with monitors. I used to think about variety, then I noticed a difference in growth alone as well females that produce eggs, as opposed to females that dont even grow. Good luck.