I agree, the pilot needs work Opjose. In fact I havent flown in close to six months because our field was out of operation with tall uncut grass. I also agree with nose weight and throttle management comments you make, just I dont want to lose the airplane in gaining those skills back.

If 0.1 to .2kgs is not much of a weight gain (actually its 0.4 to 0.5kg gain as the stock should be 3.4kg) I am not too concerned. I am practicing on the sim already with scale models to get the throttle management and glide slope correct

No, I cant rebuild the tail etc. Remember, I have no counter weight anywhere in the airplane. Making the tail lighter will only make it more nose heavy.

The measures I had identified to lose weight were CF LG, foam wheels, LiFe for ignition (I am using NiMH now). I didnt use the CF gear because they told me CF is brittle (though Hobbyking was saying this gear is unbreakable). I already have foam wheels on it. I dont have a additional LiFe battery. If a capacity of around 2000mAh is recommended, its weight will be close to that of a NiMh.

I was thinking of 1300mAh with diodes in series, will that be sufficient for ignition for max 5 flights of 10mins?

Where else can the model lose weight?

Ameyam