Hello Obione, you make me feel more at ease :fumeta:
The thing is, I was just testing the regulation of the 3 fans that maintain airflow inside the case at that moment, they were all at a minimum when I noticed the heat, and since I was messing around, I grabbed a loose fan that I had handy and pointed it directly at the Z77.
I have already tested with the case closed, fans at 20% and without that direct fan, and with an ambient temperature of 26º, it stays at, the motherboard at 31º, the PCH at 43º, and the CPU at 29º-30º at idle.
After 30 minutes of testing in Aida64, they rise to 33º Motherboard, 54º PCH, and 40º CPU.
Seeing that the PCH doesn't rise as much as yesterday, I just put a quick OC in the Bios @4200 and it stays like that, 35º Motherboard, 57º PCH, and 44º CPU.
I then think that I have plenty of margin since the OC is not going to be constant at all and seeing the difference in temperatures of the PCH from stock speed to a moderate OC and with that data that it can withstand up to 100º, I can sleep peacefully.
The craziest thing is that Aida64 doesn't initially show me the PCH sensor and suddenly it appears, sometimes it never even appears and I have to restart the application for it to work after a while 
At first, I thought I could put a Maze4 block on that PCH, but it doesn't fit without some DIY, so we'll see what I do if things get crazy in the summer..
Thank you very much for everything, I'll be around here for a while to get everything fine with your help 
Regards