I like Substance, and enjoyed the free downloads through Epic, until I found that (personal preference) I wanted to work on my own materials, and not be burdened by a plugin nor purchasing what I could make for myself.
I started with Photoshop, and created some simple 1024x1024 colours and downloaded some free texture samples from various locations on the web…
Then I created the materials using a standard set of variables…
…from which I could create any number of material instances to customize the look:
It also helps to fix the UV resizing issue, as the use of the scale variable (set to 0.02) will temporarily address the issues you’re having with imported models from various sources. Mostly, however, I enjoy the freedom to create/modify my own materials to create a customized look for my game.