I've been having exactly the same experience(s).
The new trend is to very quickly find in favour of sellers. These decisions are very fast.
In my cases(s) I'm sure they didn't even look at the listings, the pictures I posted, or read my messages.
I've always paid directly from paypal funds in the past but I'm going to start backing via credit card.
I've never done a CC chargeback but I've heard about them.