Michelle Bridges - 1200cal question!!

I'm doing the Michelle Bridges (Australian Biggest Loser Trainer) 12 week body transformation - this program has you doing exercise 6 days a week with a mix of cardio 2 days, weights 2 days, core 1 day and one MEGA burn day. It comes with a meal plan set at 1200 cals. The recommendation is that you should be burning (females) between 400-800 calories per session with up to 1000cals on your mega burn day. All while eating 1200cals. I am pretty fit and down to last 5kg and usually burn between 250 (weights days with no extra cardio) - 500/600cals (cardio and mega burns) - never got anywhere near 1000cals, would take me hours! i'm always buggered and dripping in sweat - yet my mate who is not as fit and a bit bigger easily gets between 600-800cals each session.

Now, given there is sooooo much debate on this site about this magic 1200cal number and i too had convinced myself that it was too low for me, i don't understand that if its so dangerous how can this program push it so much - the meals plans are designed by certified nutritionists/dietitians. However, i also don't understand how you can do mega burns like 600-800cals (6 days a week) and only eat 1200cals???????

I went back to the 1200cals (well try too, more like 1300) when i started the program because i was convinced they must know what they are talking about as its worked for so many and i was terrified that the plan wouldn't work if i was eating 1450cals - I am now again tired and have poor recovery. My weight loss has stalled in the last week - but i'm now confused as to whether its becuase i'm so close to my goal (i'm 65 aiming for 60-62) so can't expect to keep losing 0.5-1kg a week, i'm not training as hard cos i'm tired, i'm not eating enough, or i'm not eating the right foods at the right time for recovery or what the heck is going on! I'm 169cm and 65kg - i eat about 110-130g protien, 100-150g carbs and 20-40g fats usually. I take liquid iron, fish oil, vit D and a multi (this one sometimes). I'm not a great sleeper - usually very restless sleep. I eat very healthy - lots of veg and lean protein, low fat dairy, berries and occasionally sushi/thai and the odd champers on special occasions. Maybe a 1-2 pieces of dark chocolate. Drink about 2-3L water daily.

The program shifts UP a gear this week and cardio is now even harder, so i'm not sure how to survive on the 1200cals - i do more like 1300 cos im too hungry otherise (and even still but try to deal with it)... so maybe 1200 IS the magic number and i'm just not sticking to is exactly?!?!?! who friggen knows!

I just don't get it, is this what it takes to reach your goals - esp when you get down to the last 5kg?

I'm stumped.