yamaha trb jp problem

[southernconfort]

hi

i have strange problem adjusting dual truss rod on my yamaha trb jp
bought 6 month ago and first day make change from roundwound to flatwound rotosound
before on my old bass when i replace round to flat string, need just a 1/4 turn on each truss rod and everything was fine
but on trb jp after 8 whole tour was enough to get right relief
so i release all 2 truss road to a minimum and make quarter turn every half hour and make relief good but not perfect
problem is next:

If i setup both truss rod on 4 full laps, on bass side i have a good relief, but on the treble side is too much
If I reduce for 2 full rounds treble side off relief is not perfect good, but the c string is too close to the first fret?
After I lifted string on bridge about 1 inch seems ok but it is simply too much for normal play
I tried to lower treble truss rod until I came to a minimum but still not enough
when i press 24 fret on c string, string also touching first fret
c string is too close to 1 fret ***?
2 truss rod : one is on 4 rounds and 2. is on 0 and still not enough
with this setup relief is almost good???
it is simply impossible to make a harmonic slide because when i make little pressure on c string like when you play harmonic, string is touching the 1 fret
the G string is in little better situation and the other looks all ok

ps

If the dual truss road are parallel its setup a equally
If they are in v position, treble side setup a normal and bass side just a little to assist him
in my case is not good neither

what to do???