After years of practice, the arco sound on my Spirocore mediums is starting to sound less like goose farts and more like real music. However, I still have an ongoing issue where the bow occasionally sticks/grabs on the string, causing a pause before I can get it engaged. I think that cleaning the strings with alcohol and brushing excess rosin off the bow may help some, but isn't a cure. FWIW, I'm using Oak 'soft plus rosin. Is this a technique problem, or just too much rosin? Thanks for the input.