Any suggestions on keeping oil in the valve cover?

I’ve done two gaskets and it is still pouring out of the left front. What is everyone’s thought on removing the “blanket” that is inside the cover. I’m wondering if that isn’t directing the oil to one side.

~Justin

1937 Chevy 1/2-ton
"Wylburr Clyde"
In the Stovebolt Gallery
More pictures on Google

My Grandfather bought it new and Dad drove it through highschool. The 3rd & 4th generations put it back on the road on 8/8/2015!