Hi, the video isn`t working for me? From the photos I would say the monitor is just a touch "heavy", definitely NOT obese, I would advise feeding a diet of 50% vertebrates to 50% inverts, rather than mostly rodents and fish (though they are both excellent in themselves).
Absolutely no disrespect to Wayne, but people should not look at his monitors and think that they are (or were for a time) in such terrific condition (not as hatchlings/juveniles, rather as they came into adulthood). A well fed and healthy captive Savannah monitor (young adult upwards) starts to look fairly "stocky" (that does not mean too heavy), both Wayne`s were "underweight" to some degree (too slender, in my opinion). I am aware that the stress of being housed together meant one animal was dominating the food for a period which led to a difference in growth.
I know he offers them excellent food items but I think they would do well if the amount were slightly increased in total, and as Wayne`s stated they are extremely active, I don`t see any problems in doing that (they will not become overweight and unhealthy)!
You might slightly decrease the amount (maybe you could offer rodents 3 or 4 days a week rather than every single day).
As always, the amount of energy they need depends on the amount they use. If they look a little chubby reduce somewhat, a little skinny, increase (it`s so easy once you know how)!
Do you know the length and weight of your monitor (an actual measurement, not a guess) ?