Scaling of instantiated ParticleSystem

Hello, I have some prefabs with particleSystem and I am creating instances in the runtime (when a missile collides for example).

I would like to change the scale of the whole effect for every created instance. I know transform.localscale is not my friend, particleSystems are not affected. So I've tried to search for something in ParticleSystem and I found startSize, but it is working just in some cases. I am not familiar with particles creation pipeline (and I didn't plan to be at this stage of my experimenting with the Unity, I'm just using some free data), so there is probably something more I need to do.

Can anyone help me please? Some example?

Thanks!