Tried again yesterday with the setting for the pot on 8. Much better results but on one side of the bullet I have a sort of grey powder looking effect. I think this is me now getting the mould too hot - at least that's what the Lee book says.

Took the advice on fully opening the spout - spilled a lot of lead as I wasn't ready for how quick it comes out! I guess I just need to practice now, many thanks guys for the advice.