You seem to have done everything correctly.
I would make sure the intake is not out as far as angle/flatness/etc.
I would also switch to another sealant, as I have had the Right Stuff become porous and leak exactly the way that you're seeing, except in the front. I used to use the Right Stuff until it did that to me....then never again.
Also, make sure you force the sealant into the crotch of that area. I always aim my caulking gun into that area and squeeze the trigger to make sure silicone goes as far as it can into it. If there's any little hole there whatsoever,
oil will find it.
Remember, the head drains are pointed RIGHT AT the china walls. Run the sealant up high enough on the intake gasket so that it builds a dam to keep
oil away.
If you want to use what I use, grab a tube of Dow Corning 732 clear silicone off of Amazon. It's FE proof and it's all that I have been using for several years.