A good config.txt for pi4?

Tearing is an issue with the fkms video driver in LE 9.2 - that's fixed in LE 10 which uses the kms driver.

Keep config.txt as is, if you have issues with HEVC files you may consider increasing gpu_mem to 384 - ebut that's only for LE 9.2, in LE 10 things will be very different.

Do overclocking at your own risk and always keep in mind that things under the hood may change and your overclock settings may result in an unstable system after each update. So if something's odd first thing to check is if it works stable without overclocking.

so long,

Hias