You need to fix the UVW correctly - don't stretch elements from a same adjacent face, try to cover completely the square area map acoordingly.
Here's a tip: take the chess procedural square map and repeat it in 10x10 times, then apply on the object: if there are squares who aren't rendering correctly or becaming blurry, you made a mistake and need to roll back and try again.
It takes years of experience to reach satisfatory results with UVW unwrapping in any software. It's not easy, but keep your cool and try again and again until you reach a nice resolution on the map. Remember: 2048x2048 DDS format is the fastest and smaller. Good luck!