What I know is that I have made this adapterIf you are sure that the problem depends on the adapter, why don't you send it back so I can check it?
I confirm that the adapter received confirms what was sold as it features a buffered system which may also be different from the much celebrated 74LS08 (electronics is a very vast field), the same thing also applies to this trite amplifier (there are many models and various systems)
Therefore if you want to proceed with chiseling the adapter together with Amiguon you are free to do so, but then I do not accept complaints or other discussions.
I would like to point out that today there are thousands of people who happily use it
Everything is written in a constructive way
If you want to send me back I'm available
and I have exactly the same picture like I have with yours, in 3 monitors.
About sending it back..
I am waiting for some people to confirm that in A1200 they have better picture with you adapter compared to any other they used to have.
The only reply was from @softinn who has not confirmed a better picture.
Maybe our 1200 has a problem.