The only way you are going to catch SKS brass is with a catcher attached to the rifle. I picked up a CTK Precision universal brass catcher that looks like a big fishing net. Used it sitting on the bench, on a small tripod, on a taller tripod, propped up and angled over my rifle, and any other position I could think of at the range a while back. I am sure the RSOs had a laugh at my expense.
Out of 80 rounds fired, two ended up in the brass catcher. Some would hit it and bounce away, some flew in front of it, over it, behind it, and under it. I was fortunate to recover all but one case.
I was using handloads that are more consistent than any available factory ammunition, and the rifle was shooting very well. It just ejects brass all over the place. From what I have seen, many others have the same issue.