Autohydro ballast tank loading problem

I have a work boat with two ballast tanks forward & aftward
I am using Autohydro software , and trying to find loading condition for these both tanks so I can acheive 0 trim and draft of 1.4 meter
so I use a combination of two macros :
one to load delta on the fwd tank and load rat on the aft tank and a second macro to load delta on the aft tank and load rat on the fwd tank and then I alternate between the two macros several times.
the result were : 0 trim was acheived , draft in that condition was 1.37m ,
here is the macros :

macro FD
trim 0
fix trim
solve
load (FBT_AFT.C) rat
vary trim
draft 1.4
load (FBT_FWD.C) Delta
/

macro AD
draft 1.4
load (FBT_AFT.C) Delta
trim 0
fix trim
solve
load (FBT_FWD.C) rat
vary trim
/

execute fd
execute ad
execute fd
execute ad

can any one help me why I can't get 1.4 m draft
over

 

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