The enormous HFC phase-down step in 2018 and the limitation of the GWP value to a maximum of 2500 from 2020 onwards will leave you no other choice:
If you plan on staying in business, you need to withdraw from R-404A / R-507A – AND AS SOON AS YOU CAN!

Find out exactly what this means, what risks it involves and what you can do about it in the brochure attached below.