Well I can tell you that you should be pretty happy! I have a FT RC8T with RC-M chassis kit and love it. Raced it all last summer and all that I broke was the rod end on the rear chassis brace and bent the brace, made a quad out of a double double! Very durable truck that impressed even the diehard nitro guys. Truck handles great, turns great, very stable, flies straight, and was easy to correct the attitude in the air when it needed it.
Not sure of the specs on your servo but I would guess it's not as powerful as the 7955 so I'm not sure how well that will do for you. The 7955 may be overkill but it's nice to know I have extra strength there and the servo shouldn't have to work as hard, therefor last longer.
My other concern is your batteries. Neu batteries are excellent and I just ordered another for myself. However, running three different weight batteries is gonna effect your handling, the truck could handle very differently with each pack. Also the 3300mah in particular may not hold up to the current draw. I would recomend using the 5000mah pack for longer mains, it may only be 25C but the added capacity will give you longer run time and it's actually capable of a higher discharge than the 4100mah 30C or at least about the same, my brain isn't doing the math to well at the moment.
Last year I ran a 1515 2.5D on 5s and both my packs where 4500mah 25C. With an Eagle tree data logger I had a peak of 167 amps I beleive. This year I will be running 2 different packs myself, which may throw me off. I am going to run a CC/Neu 2200 and 4s, just ordered a Neu 5500XP 25C as my main pack and I'm gonna make a 4s pack out of one of my 5s packs, already robbed the other pack to make 2x 2s for my Maxx.
http://www.rc-monster.com/forum/show...ight=Rc-m+Rc8t
There is my build thread, it may or may not help