I've been using the same combo and I agree it's not great. Not sure which is more at fault though, the £15 lance or the cheap snow foam...
I find it good for soaping the car however, if you're quick you can use the mitt to foam it all up a bit more and give time to go over it a second time correctly.
Gonna keep using it until it's all done, then maybe invest in a decent lance and find some really good frothy foam