The cover on the passenger side has always been leaking. I did it a while back and didn't seem to last 5 mins. Did it again at the this week and didn't last a day.
I used a little bit of Permatex Black Ultra on the half moons and timing cover joints. Followed the instructions and to install the cover finger tight, leave for an hour, torque to spec. The surface was spotless and wiped over with acetone . The cam cover was cleaned and all the groves for the gasket cleaned, yet there is still oil just below where the timing case cover join is next to the dipstick.
When I did it first time, a couple of the studs came out with the cap nuts. I refitted them back with a bit of blue Loctite and noticed that sat a little bit lower than the rest. Then when installing these back, some of the other nuts bottomed out before I thought they were really tight enough to clamp the gasket down.
All new gaskets were used both times and the new gaskets for the nuts and bolts too.

Anyone had a similar problem ? Kinda driven me mad to do it twice and failed.

Just a thought: Did you tighten starting from the middle?

What is your crankcase pressure like?
What is the PCV set up looking like?
What is the cyclonic oil separator and pipe work looking like?
Any fault codes on the system?

Start the engine and pull the dipstick is there a reasonable amount of vacuum?

As far as Im concerned this engine has incredibly poor design around the cam cover head interface, why on earth they didnt bring the top of the head up at least 20mm on that lower edge, makes no sense, the gasket is wet constantly

I did torque it down the same as you would a cylinder head. The PVC was all done not long before I got the car by the previous owner. I'll have to check the vacuum at the dipstick when running, tomorrow.
Its kinda hard to see, but it's either leaking on the cam cover gasket as the timing cover join, or its actually the timing cover gasket right at the top. All along the rest of the cam cover is bone dry and so too the front.

The vacuum hoses are way more than what you can see just at a first glance.
You need to check the hose at the bottom of the cyclonic filter that passes oil over to the sump

How was the vacuum at dipstick?