Thanks Eddie, found out what the problem is !
If I'm right, the head bolts are tightening at the end of the block !
Which means they cannot tighten any more because they have no more threds to bolt in !
so with the bored down heads, they were ok while the gasket was new and with no pressure !
I have unscrewed the bolts one by one, in the correct tightening order, and tightened them back on pushing all the way to the end. Had the tool set to 98 Nm's this time.
So far it seems that they are no leaks. If they come up again, I will change the bolts to new ones and check their length !
What worries me is that the gasket will be ruined if the leaks appear again, and I will have to do what Eddie said
so hopefully we wont get to that point !
What surprises me is that the right side is perfectly ok, only the left gasket is leaking