V Beam laser settings: what number setting, limit, to avoid bruising?

I,ve had two v beam laser treatment , for facial redness, but can,t see any improvement. the first treatment there was no over lapping, second treatment their was. The first treatment was painful, the second not at all, does this mean the setting could have been lower, than first one. Increasing the settings, does it become more painful? What can you suggest, that might make treatment more successful? I don,t want to be bruised. thanks.