I would be interested in hearing about your rocket settings in the weapons.
I haven't edited anything, using the Campaign's default weapons data...
[WeaponData001]
TypeName=75_rocket
FullName=7,5cm Rockets
ModelName=rocket_2-75
Mass=8.390000
Diameter=0.070000
Length=1.440000
SubsonicDragCoeff=0.200000
SupersonicDragCoeff=0.370000
AttachmentType=
SpecificStationCode=
NationName=
StartYear=0
EndYear=0
Availability=0
BaseQuantity=0
Exported=FALSE
ExportStartYear=0
ExportEndYear=0
ExportAvailability=0
WeaponDataType=1
RailLaunched=FALSE
RocketPod=TRUE
Retarded=FALSE
FinStabilized=TRUE
SpinStabilized=TRUE
HasGrowl=FALSE
EffectClassName=SmallRocketEffects
ReleaseDelay=0.000000
WarheadType=0
Explosives=3.950000
FusingDistance=0.000000
ClusterBomblets=0
ClusterDispersion=0.000000
GuidanceType=10
Accuracy=70
MaxTurnRate=0.000000
MaxLaunchG=2.500000
LockonChance=0
LaunchReliability=100
ArmingTime=2.000000
SeekerFOV=0.000000
SeekerGimbleLimit=0.000000
SeekerTrackRate=0.000000
SeekerRange=0.000000
CLmax=14.000000
MinFreq=0.000000
MaxFreq=0.000000
MinLaunchRange=0.000000
MaxLaunchRange=0.000000
Duration=60.000000
CounterCountermeasure=0.000000
NoiseRejection=0.000000
CapabilityFlags=0x00000100
LoftAngle=0.000000
DescentAngle=0.000000
MaxLoftAltitude=0.000000
BoosterStart=0.000000
BoosterDuration=1.700000
BoosterAccel=34.299999
BoosterEffectName=RocketFireEffect
BoosterSoundName=Rocket
BoosterNodeName=
BoosterPosition=0.000000,-0.510000,0.000000
SustainerDuration=0.000000
SustainerAccel=0.000000
SustainerEffectName=
SustainerSoundName=
SustainerPosition=0.000000,-0.510000,0.000000
InFlightEffectName=RocketInFlightEffect
InFlightSoundName=
ReleaseAnimationID=1
ReleaseAnimationTime=0.300000
ReleaseAnimationDelay=0.050000
EODisplayFlags=0
CEP=25.000000