Idk how many individual threads we need, but I started an improve DEE set thread about this set less than a week ago.
I had very different suggestions than yours for improving the set, as per the linked thread above. This thread basically looks at spam vs non-spam DEE and the set. My thoughts were:
^Perhaps it needs both this and your suggestions or a combination of sorts.
I think you can viably use acid rings at present.
Final March boots item is likely needed for a boost to DA/Slow resistance and %physical resist as things currently stand - but using these boots is not necessarily unique to acid builds as these boots are a strong epic item.