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Ok guys, I found my problem. My Injectors don't like to inject any fuel below 1.5 ms pulsewith.
This is also the reason why i'm having some troubles idling.
This can be fixed by playing with the dead times, right?
There's no "playing" with dead times. Either the dead time is right or its not. If it's wrong your whole ve map will have to be retuned. If you have decent injectors there will be posted dead times available. If you have not great injectors you have some work to do to figure it out.
After months, I finally found the solution to my problem.
Because I have an 1990 1.6 engine, it was running batch/semi sequential injection by default.
Wiring up fully sequential injection (have an MS3) instantly allowed me to idle at 14 afr without surging.
Problem at decel is also resolved.
Once you go bigger injectors (i have 560cc), sequential is a must it seems.