Reply to JOYO project - yaeltex controllers

Hi there! i'm new to this community , I like to build MIDI controllers, I've done few this far.
Some of them are simple projects and some big ones, and I would like to share it with this community

I started a personal project that I like to call JOYO project, witch consists on using broken and unused gamepads to transform them into midi controllers. Most of materials used for JOYO controllers are recycled (old boxes and buttons).
This the first 3 controllers of JOYO series:

La trolita:


La Pichincha:


La Pistera:


I want to share this cheap but fun projects and also know other people working with gamepad to midi projects.

This far, my main functionality problem is in La Pichincha rotary sliders. I connected 10k linear pots yo Analog Joystick contacts from the gamepad, but just works in about 30% of the rotary potentiometer rotary range. I mean that signal gets from 0 to 100% in just 1/3 of all range.
Am I been clear in this? I could take some pictures if necessary.
Does anybody knows how can I solve this problem?

I'm really sorry about my spelling mistakes, I'm from Argentina.

Thanks!

PS: You can check my other midi controllers projects here