There is a bushing for gudgeon pins on nearly all diesels. If that wears. You have an extremely beat to shit engine. The rod bearings will be bad too. Btw, the noise they make is very unique, a bit tinny tapping but very rapid.
Looks like you are back to square one, you are going to have to do a full overhaul.
And yes, replace the 2 injectors with wrong values, they probably are from a different spec engine altogether. Running mismatched injectors can cause very rapid engine wear.