Great to hear you built one Alvin
You should not have to remove much from the tail to drop weight. I would start by making a new stab and elevator from the lightest balsa you can get your hands on. A lightweight rudder will help as well. Lightening holes may help somewhat as well.
If you drop 1/4 to half an ounce from the tail, you will not have to add more than 1 oz or so of weight to the nose (because of the effect of the long moment arm).
If you do add weight, add a dubro spinnernut and a bigger batterypack. Added weight might as well be useful.
Lets see some pics of it. At 12 oz's, yours may be the lightest yet. Should hover and 3d like a dream!