My coffee machine is only 2 months old and I have read the instructions carefully and am still unable to make a coffee with a good crema on top. The 'crema' is full of small bubbles like a capuccino froth and though the flavour is good and the coffee fresh, the look of the crema is very disappointing. I have owned three other machines ( all Breville) and they have always had excellent crema, so it's not the way I'm making the coffee. What is wrong? Regards, Keryn.