Tekkers and me being lazy

[Mirinee]

Is there a guide on tekkers somewhere?

I know that finds for tekkable items is different for different section IDs, but after finding a e.g. ???? railgun, a tekk with the Bluefull ID told me it's in the Heart, Mind, Soul, Geist family. Here're my questions:

Does which tekker you use from now on matter? e.g. Can it ever be something other than Heart, Mind, Soul, Geist if I go to a tekker of different section ID? (Too lazy to try it out!)

I know that attributes with 0% before the tekk cannot change, but is there a pattern to how much the changable ones can change? e.g. it started off with 5% native and 5% hit. Do both of these just fluctuate randomly with each tekking?

Sorry if that was confusing. And I hope that they behave in the same way in both Ver2 and Ep1&2. Please help .