HD Flexo - Lowest line anilox?

[WI-Flexo]

Question for anyone using HD Flexo. With the new screening on the HD plates what is the lowest line anilox you can succssfully print with? I know Esko reccomends 800's or above but with the new screening could we expect to be able to run spot colors in say a 550 or would we still be dipping dots into cells? The problem we have is our spot colors do not get to density with the higher line anolix's. Any suggestions would be great.
Thanks