Hi,bought an Ares on a good deal to see if I could get on with rta's,came with pre made coil and cotton.After fiddling about I got it ready for puffing,filled with liquid and puffed away,at first the flavour was good,but after half a tank the flavour got muted,tried different juice but with the same outcome,I'm guessing here but would it be something to do with the cotton?Ta