Crap, not again! That really sucks, I feel for you. But try not to get too discouraged, take it as a challenge to be conquered.
Maybe its time to step back and review the big picture; could there be variables at play other than pre-det (warped head, block surface, etc)? I know you are on top of things but sometimes I find myself discounting possibilities without verifying and triple checking because I was SURE that wasn't it...only to later discover it was. Perhaps consider going to ARP studs in place of bolts and a Cometic MLS head gasket? Just throwing out thoughts. Four times is not a coincidence.
As a side note, regarding Victor Reinz gaskets. I don't want to stir up any controversy but I learned something very interesting while attending a international trade show for aftermarket automotive parts suppliers. As I was walking through the exhibits I recognized a very familiar oil pan gasket with integrated windage (splash) tray on display (non Fiat). So I stopped to talk with them; a family company from China that manufactures gaskets, seals, etc. Turns out they make most of Victor Reinz products. I was skeptical because I've seen "made in Germany" all over VR stuff. They showed me pictures of VR himself at their China plant (a very large, modern facility), and pictures of them with VR himself at his facilities in Germany. Plus they showed me samples of several products they make for him. They went on to explain a little about the business arrangement they have with VR; exclusive manufacturing of a ton of products, packaged in VR labels. Furthermore they also supply similar products to several other well known 'big brand' companies in other countries. This perplexed me enough to do some research. I discovered Germany has a law that allows a German company to take a product made anywhere in the world, provide some sort of "enhancement" to it, and then declare it as "made in Germany". The concept being the product has been improved to German standards by the German company and it is now a German product. However they have also declared that such things as placing a German brand label on the product or re-packaging it in a German container constitute "enhancement" of that product. Therefore they can then place "made in Germany" on something despite it being manufactured somewhere else with no real changes to it.
This should be no surprise however. 1) We have all heard that just about every large corporation in the world has manufacturing plants in various countries, including China, India, Vietnam, Korea, etc. 2) Most companies are in fact subsidiaries of, owned by, or otherwise related to another larger conglomerate with world-wide facilities. 3) The origin of a product does not necessarily dictate its quality; some incredibly high quality items come from China, some incredibly low quality items come from the USA, and vice versa. 4) You don't always get what you pay for...price is not a reflection of quality (welcome to 'marketing'). 5) After more than 45 years involvement in the automotive industry very little really surprises me anymore, I've encountered many such situations.
To be clear I'm not knocking VR. Personally I have found VR products to be good. Some of the best products I've ever seen originated from China and he seems to have found a very reputable company there to make his stuff. Unfortunately, after talking to the family, I now know what VR actually pays for those products vs what he charges for them (Ouch). Although 're-branding' and absorbent price markups are common business practices, its a little harder to accept when you know about it.