I think its the tyres. I am also using CC6 now. Have to admit these set of tyres are comfortable and silent. However, when it comes to traction on wet roads, the condition is a bit tricky.

Grip is much lesser and drivers on CC6 MUST slow down on wet road / rain.

I've been driving the same car for 10 years and never had ABS activated before. On CC6, already twice it was activated.

But no doubt the CC6 tyre is the most silent and comfortable.

Since I don't drive fast, I guess my next set of tyre will be the UC6 which is a step up above CC6 while offering silent and comfort ride.

But your CSC3 was already very old model. The later CSC5 was already much better not to mention the current CSC6, ECS, or even CPC6. But yes UC6 is a much lower class and not good.