Which compound Schuey minpins for carpet?

[Spoolio]

Just got a 2nd hand Blitz with slightly worn Kourse Kings. It does NOT want to steer at all on carpet. If I get some Schumacher minipins would it be best to have Yellows all round or Blue fronts and Yellow rears or Blues all round? My preference is to have a bit of understeer and a more planted rear if poss but at the moment it's just silly. I've got my steering set to 100% but it's behaving as if it's set to 10%.