Well I have done Growth Surge, with Mag 10, but will try and give you a hand/suggestions.
Your plan sounds great all in all. Doing short bouts of 2 a days between cycles of lower volume can have a great growth effect Mag 10 or not. I have done several such littel cycles with Tribex and had great results.
I would suggest that you do all you said eat like a horse, sleep like a bear, and train like a mad man. LOL
Aside from that my suggestion would be to start the Tribex a couple weeks prior to the two a days so it is in full effect. Add in M if you can get it there. Depending on your own metabolism and how you respond to Short bouts of MASSIVE EATING. I would say possibly drop the k/cals a bit from what is recomended. You will not be receiving the benefit of the SUPER CHARGED protein turn over from the Mag 10.
Thats about it I guess. Just do waht you can to help aid rewcovery. Eat a lot. Dont short your self on protein or carbs, and get more than enough rest.
Hope this helps,