Oil leak at valve covers

TrailBeast said

I used to use the black rubber gaskets with a thin coat of RTV on both sides, and making sure I had RTV between the bolt shafts and oil side of the rails.
Never a leak.
Cork always seems to seep eventually, and the rubber with RTV never will.

Now that I have aftermarket heads with machined flat rails I use the metal core rubber gaskets, but still use the RTV exactly the same way.

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I don`t want to glue both sides, running a solid roller, need to remove once in a while to set/check the valves---- I do have a pair of $38 gaskets on it now. I have built heat guards to help keep the heat off of the valve covers and gaskets, #1-2 tubes are very close to the covers w/ raised port heads. It burned the cork, rubber steel reinforced, and every other kind I tried , ones up after a while , hoping these carbon gaskets will hang in there.