This is what I do.
(FIRST A WORD ABOUT SAFETY)
DO ALL THE BELOW AT A ROTOR SPEED NO MORE THEN NEEDED TO SEE WHAT THE HELI IS DOING)
1. First to avoid ground effect,I mount my helies on an old magazine rack TO GET AWAY FROM THE ROTOR WASH BEING BLOWN AGAINST THE FLOOR.
2.I secure it to the top of the rack with rubber bands.
3.I run it up with all sticks and sliders centered then see what it wants to do.
If it wants to lean to 1 side then make the correction on the linkage,(usually 2 turns)
Then fire it up again and now maybe problem 1 is gone but the nose may want to go up or down.
Again adjust the appropriate linkage..
As for your tail rotor you may have to adjust the linkage or maybe remove the servo arm and go up or down just 1 spline on the servo shaft.
When you do all this put the heli on the floor and see how it acts.
It will seem a bit unstable as long as the blades are so close to the floor but when you bring it up about 4 feet, stay away from it and sight in on the blade tips and make sure they track really nice and close.
You should only see one blade top at the speed where it starts to lift or hoover.
Next tie some mono line (APPX 5 feet should do) on each side of the fly bar bar as close to the head as you can.
If it's nose or tail heavy then move the battery around until that heli is hanging horiziontal.
All 5 of my helis here pull straight up off the floor and I can let go of the TX and they just sit there and sort of move around a bit.
Let us know how you made out.
Vegas/