i dont know much about the discs your using but i heard the darker the disc better the copy!!!
for patching games use ppf-o-matic and download the patch u need, unzip it then run ppf-o-matic select the patch file then the game u wona patch press apply that it.
for pal 4 u only used it once for crash bash just selected the game and let it do the work , it worked fine for me.
im new to burning ps games too so email me if u have any trouble (
[email protected]