But as in negative processing the development must be adapted to the chosen EI.
That's right. In negative processing, to get EI of anything close to 20, the use of the special purpose developer Adotech is mandatory. The film loses speed substantially in other developers. Interestingly, for reversal processing of Adox CMS 20ii, Adox recommends using the Scala kit which is a generic first developer and not really a special purpose developer for CMS 20ii. So I wonder if EI of 20 is possible with this kit.

