Flat or rounded back for sinew recurve?

[silent sniper]

Howdy everyone,
I’ve never built a sinew bow before and had a question relating to the back profile. I am building a 57” hickory recurve that started life from a board. I’m getting ready to sinew the bow and have the option to make the back any profile I want before I add sinew. Is there any advantage to gently rounding the back of the bow to work the sinew more as compared to a flat back?  Any other ideas/opinions on the back profile of sinew bows?
Thanks!
-Taylor

[Yooper Bowyer]

I would think a crowned back would elevate the sinew above the neutral plane more and so make it do more work.

[bownarra]

Rounded with the sinew crowned on down the middle. One thin layer to cover it all but all the rest down the middle.