shims or timing ?

I will open the top block tonight and check my timing again... To see if something is strange and see if the 0 pin is the one more close to the crankcase.
Btw if i'm at the 28e pin and the arrow of cameshaft always come to the front with the T mark aligned my timing is good...
I will add oil directly on the shims on the right part of the engine.
It is really a metal click so i don't trust about the exhaust but i will check.
Any more idea is welcome