HIIT is great for fat loss.. I have been doing it for years when i want to drop bodyfat fast.. Also you may be putting yourself in too a large calorie deficit.. that alone will kill fat loss as well as all of that fasted cardio.. You must remember you are not a geared up Pro, who can do cardio twice a day, maintain muslce and get shredded.. It just doesnt work that way for most natural trainers who are not using a pharmacy.. Of course you can loose weight by doing lots of cardio, but most will be water loss and muscle..
You must have balance when your goal is fat loss.. As much as any of us would like to lean out in 30 days and look great, the reality for most ( not all) is that it is going to take months to reach our goal.. And no amount of supplements will do the trick either.. They are only an aid..
The amino's will help with cortisol levels yes.. but it is a gradual thing and an accumalitve thing as well... The longer you keep your cortisol down, and keep your body from being in a starvation mode you will drop weight.. Depending on how insulin sensitive you are will also play a role
Your macro break down will also play a major role.. A person could consume 2000 cal. of snickers and wonder why they are not losing weight.. Its not all about the calories.. It is true that if you burn more than you consume you will lose weight, but this only goes so far..
Give us the break down of what you are consuming..
I would also suggest that you dont consume anymore than 1 gram of protein for each lean pound of bodymass for now.. Meaning you dont count your fat weight in this equation.. that will be plenty IMO while you are dieting.. Afterall you are probably not going to gain too much muscle while dieting.. Yes it can be done, but your goal is fat loss at the moment not bulking.. they are too different goals and calorie needs are different for each..
Anyone of us could type a book about what to do or not to do, but lets find out what you are eating..ie..
Protein 200 grams
fat 50 grams
carbs 75 grams etc etc
Later on you can up your protein intake to 1.5 or even 2 grams per lb of lean bodymass..
Only do 30-40 minutes of HIIT.. that will be better than your 2hours gig now..
What are your stats..
Age
height
weight
years training etc..