Ok, I have a 3/4 student bass that came with a white haired French bow. I have put Spirocores strings on and using Nymans professional rosin ...however... The majority of the time I use the bow i get what could best be described as 'whistling' and harmonics. If i apply more pressure, the odds of getting the 'real' note are greater, however its then obviously scratchy because of the pressure. I know Ive got the grip correct, and from what Im aware of, my technique isnt too shocking, from successful previous violin and cello playing. Any ideas?