Timing question

[Swiftdoog]

you gonna be mad...

I was advanced, actually 1/4 off a thooth advanced, see attached drawings.
This is what I had, everytime I tensioned the belt, the cam would 6º to the back. Did some math and apparently is it 6º, but don´t is advanced or retarded, but by the pinging on "supposedly stock conditions I am gonna guess I was 6º advanced.
   


This is what I did, I hope that it was the right thing to do, since now (oddly enough) the car starts quite quickly and not fighting the starter, on stock settings.
   

But... there is always a but...

If I suddenly push the throttle, like kicking it, it makes a sounds, like way overadvanced sound. But if I push gently or normally it doesn´t make it. I applied Drive and pushed the gas normally and no pinging, but that sound it made worried me a bit.

It is clear that I don´t have stock conditions anymore on the engine. I know I should just ditch that head and get another, but right now I have to survive with this one.

The question is, what I did was right? or should I go back to where I was and compensate? but then how?