Which Vapor Equalizing Valve Should I Use?

Gabe_3

I currently have a Gorton No. 4 on my steam riser in my bathroom.

I live on the top (5th) floor of my apartment. When I plug the hole no steam reaches the pipe. However, when using the No.4 valve I get alot of steam in the bathroom causing condensation everywhere.

Is there a more sensitive valve that will close more quickly that I should be using?

Thanks in advance!