Maria and Abhi, Good question!  It was not clear to me what was deemed to be the optimum value.  I ended up picking the lower bound value in hope that this point could resurface should someone care.  I am glad that you do!

I guess 128 might work today, and 256 possibly gives us a bit more headroom in the near future.  I suggest that we pick 256.  What do you think?

After getting to know a bit more about how the grand scheme of cloud foundry works since then, I agree with you for the changes you suggested.  I am happy to include changes to dea.yml and config.rb files to this pull request, and to issue another pull request for changes on the dea.yml.erb in the cf-releases component.
 
Thank you very much for your feedback.

— @jackfengibm