"Wire wicks....... How do you manage to vary the flame height? [/quote]"
Not sure what a wire wick is. Have used with good results a real fine mesh stainless steel screen rolled up tight as a wick. This works good as the fuel runs out and flame goes down it won't burn the wick.
To control flame size instead of moving the wick up and down a brass tube that slips over a brass tube that holds the metal wick slips up or down to expose more or less wick controlling flame size.