I don't know what you mean by blurriness and color shift. I will ask them for sure. The rest of us do not have this issue. I compared the results from this manufacturer and the other one and yes the colors are different I agree, mainly the light blue on the blue chip. I imagine it is normal they don't have the same printer. Now to fix it I do not recommend the trial and error approach. I recommend you look at the other videos to find the blue you would like and use that one. You can look at my 25c (Priorities) for example. If you like the light blue there you can ask
@timinater to use the same one as he did my design. If you don't like it check the other designs and ask people their blue if you like one. I hope that helps.