It sounds like your parts are working as designed.

They're just not working well together. The components are not well matched and I've seen this before in these kits. The master is too big for the pedal and calipers.

They do not list the caliper piston diameter. We need that info to find out what is going on. I bet a smaller master will fix the issue.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon