After searching for answers on this, I found, that using Atmosphere Curve works for me. You can tweak to your liking.
@PART[*]:HAS[@MODULE[ModuleEngines*]]:FINAL
{
@MODULE[ModuleEngines*]
{
@atmosphereCurve
{
@key[1, ] *= 1.7268
@key,1[1, ] *= 1.7356
@key,2[1, ] *= 1.8595
}
}
}