Well in the true spirit of my motto "moderation is for cowards", I drilled the valve cover baffles today. To me this is quite enlightening. I don't actually think the S13 valvecover has a baffling issue, I think it's a flow issue. I think the biggest advantage of the S14 cover is that it has two outlets.
As you can see, the opening to the baffles is blocked by a folded screen. The oil/gas then has to go all the way down the length of the valvecover, make a 180* turn, and then halfway down the length again and out the side. What I think is the biggest weakness here is that this is the
only path for blowby to take under boost, and the valvecover outlet is very small. With only this to breathe out of, I'm betting pressure buildup causes oil to be pushed out.
I'm unsure if just drilling out the hole in the side of the valve cover will do the trick, but I'm betting it'll help. Or I could plug the hole in the side and do the welded -10 bung... Or both... Gotta do some more thinking on how I want these lines routed...