Incorruptibility
As far as incorruptibility goes, I know very little about any cases of such. You mentioned a couple of cases. One of them was Saint Zita. I don't know much about her, but I did track down a postmortem photo and, although she appears fairly well preserved, she also appears to be in the early stages of genuine
putrefaction.
Stigmata
This phenomenon has always interested me, but I don't know enough about it to make any kind of assertion. I'm certain that some people have committed fraud to pass it off as a legitimate phenomenon, but I can't say whether true stigmata has occurred as the result of a divine miracle.
ESP said to be possessed by certain priests.
Again, I'm interested in this subject but couldn't tell you one way or the other how I feel about it. I know that we all have some sort of intuition and I can't explain that currently. Perhaps people with ESP have a very heightened sense of intuition. I'm also fascinated with deja vu, which I associate along the lines of extra sensory perception. I actually had a case of it about a half an hour ago. I also can't explain this phenomenon, however, that's not to say that it can't be rationally explained.
I know that the CIA invested a lot of time with this field of study. Certainly they believed that it was worth the time and money and to tap into it. Of all the "miracles" listed, this one seems to me to be the least miraculous. If it is real, I certainly would ascribe that to God, but only in the sense that we all have abilities and qualities to us that are unique. A miracle is a very, very special event that typically defies the laws of physics-- which of course, is what makes it so memorable and special in the first place.
This is not an attempt to discover whether or not these things can be proved as miracles i.e., supernatural phenomena, but to discuss possible scientific explanations, or whether some event that is unusual in nature could be used by God as a sign.
Incorruptibility could easily be understood scientifically. It would be exceedingly difficult to prove that as a miracle. Some bodies preserve incredibly well after exhumation, while others decay into dust with a few years. There are a lot of factors. The amount of oxygen present, microbials, whether embalming techniques were employed, etc. But if a body remained intact for, say, 1000 years, I would find it incredibly difficult to understand that through science alone.
Stigmata, if legitimate, seems so implausibly coincidental to be explained scientifically, that if it were found conclusive, it would likely certify as a genuine miracle.
Also interested in parallels of the same type in other religions or scientific examples of the same phenomena happening elsewhere.
That could also undermine its integrity though. The more common something is, especially all over the world, the more likely it is a natural phenomenon than a miraculous one.
Eucharistic miracles are cases in where the bread and wine used in Communion are said to have become actual flesh and blood. In some of them, the flesh was examined and found to be human heart tissue, and the blood to be human blood type AB.
Transubstantiation is certainly an interesting topic. If analysis indeed confirmed that the wine literally turned into blood, and the wafer literally turned into flesh, I don't see how any natural phenomenon could resolve that. That certainly would be miraculous.
"A man can no more diminish God's glory by refusing to worship Him than a lunatic can put out the sun by scribbling the word, 'darkness' on the walls of his cell." -C.S. Lewis