It takes a bit of practice to get it right. I had that running problem when I first started, but I have no problem controlling the running now.
By the way, there is a foam, but it's not exactly available in the UK. You can order it online...
I did a bit of searching, you can try this site arkwrights-open-all-hours . co . uk (get rid off the spaces)
There is a mixed reaction to foam, some like it and some don't. I suppose the only way to find out is to try for yourself.