Like it’s pretty much been stated, the more I try to control it the worse it sounds. I think I’m finally getting the hang of it. I find it works best for me when I think about doing V motion strokes on the strings and keeping the motion rather a shorter distance from the strings. The further you bounce the bow off the string, the harder and longer it will take for it to strike the strings again and results in a more screechie sound. Learning Beyond the Veil by Lindsey Stirling really got me comfortable with this technique and being able to go from Spiccato to to legato quickly.