To fix that problem you must open orbiter\config\poderosa\pod150.ini
That is what you get:
[MISC]
cog=10
;GNC_DEBUG=1
FOCUS=1
[TEXTURE_LIST]
TEX_1=Exhaust_atsme
TEX_2=Exhaust2
[BOOSTER_1]
N=1
MeshName="Poderosa\Turret_a"
Height=0.01
Diameter=0.6
EmptyMass=1
FuelMass=1
Thrust=6
BurnTime=133.5
angle=90.
BURNDELAY=135.5
SPEED=(5,0,18)
ROT_SPEED=50
off=(0.,0.,118)
eng_1=(0,-0.4,-1.45)
eng_2=(0,0.4,-1.45)
eng_3=(-0.4,0.0,-1.45)
eng_4=(0.4,0.0,-1.45)
eng_diameter=0.10
ENG_PSTREAM1=contrail
[BOOSTER_2]
N=1
MeshName="Poderosa\Turret_b"
Height=0.01
Diameter=0.6
EmptyMass=1
FuelMass=1
Thrust=6
BurnTime=133.5
angle=90.
SPEED=(5,0,18)
ROT_SPEED=50
off=(0.,0.,118)
eng_1=(0,-1.0,-71)
eng_2=(0,1.0,-71)
eng_3=(-1.0,0.0,-71)
eng_4=(1.0,0.0,-71)
eng_diameter=0.60
[STAGE_1]
Height=1
Diameter=1
EmptyMass=18320
FuelMass=293125
Thrust=6342595
BurnTime=136
off=(0.,0.,20)
eng_1=(0,-1.0,-31)
eng_2=(0,1.0,-31)
eng_3=(-1.0,0.0,-31)
eng_4=(1.0,0.0,-31)
eng_diameter=0.001
;ENG_TEX=Exhaust2
ENG_PSTREAM1=exhaust
ENG_PSTREAM2=contrail
MeshName="Poderosa\Stg1"
[STAGE_2]
Height=11
Diameter=4.450
EmptyMass=3374
FuelMass=40497
Thrust=697537
BurnTime=262
off=(0.,0.,45.8)
MeshName="Poderosa\Stg2"
eng_1=(0.,1.2,-7)
eng_2=(0.,-1.2,-7)
eng_3=(1.2,-0.0,-7)
eng_4=(-1.2,-0.0,-7)
eng_diameter=0.90
;ENG_TEX=Exhaust2
ENG_PSTREAM1=exhaust
ENG_PSTREAM2=contrail
[STAGE_3]
Height=8.0
Diameter=3.2
EmptyMass=1241
FuelMass=14893
Thrust=353005
BurnTime=195
off=(0.,0.,54.8)
MeshName="Poderosa\Stg3"
eng_1=(0.,0.,-4)
eng_diameter=1.50
ENG_TEX=Exhaust_atsme
[FAIRING]
N=2
MeshName="Poderosa\Fair"
Diameter=5.0
Height=12.53
angle=0.
off=(1.01,0.,61.85)
SPEED=1
[PAYLOAD_1]
off=(0.,0.02,62.6)
speed=(1.0,1.0,1.0)
rot_speed=(0.,0.,0.0)
MeshName="Poderosa\MSpoderosa"
Module="spacecraft\Spacecraft3"
name="MS"
Diameter=2.8
Height=4.
Mass=24000.
You'l have to increase 30-35 meters (you'll have to try and see) all the indicated numbers to put the rocket at the right height!