ok, I did everything to fix my heli but its still not fliying good. It flys ok and hovers great, but has no power. I can hover for 8 mins, but rises up very slowly with full throttle. Here is a list of everything I've done in replacements.
Note: I had this problem before all the upgrades, while everything was still stock. I installed one thing at a time and tested.

New xtreme motors
new inner and outer shaft
new bearings
new gears
new blades
new xtreme boom
New flybar

I've spent a whole week adjusting and readjusting this thing.

perfect blade balance
perfect blade tracking
perfect gear mesh
inner and outer shaft spin smoothly
30 min motor breaking
lock collar is loose (-1mm)
upperhead loose (-1mm)
strait flybar
fully charged batteries (3 of them) balanced at 8.4v with voltmeter.
perfect swashplate level
weight reduction
more air vents in canopy
installed brass step washer
CHECKED, CHECKED AND RECHECKED EVERYHTHING over 10 times.

Only two more things left to test. Extreme Blades and Silver Bushings for the motors, both are on order. I don't want to waist money on stock parts so I'm buying upgrades.
Is it possible that my 3-1 is bad or going bad? Is there a test I can do on the 3-1?