Years ago, when I was first starting to convert over to braids, I would use a heavier size on all of my spinners. I always felt it helped.
That may help you out. Instead of using 20#, maybe bump it up to 30#, even 40#?? Your still going to be way under the mono diameter. Snagging rod with braid........ that can get real ugly, no matter how good you are !! I still keep mono on ours.
