Lower low E one tone to a D, Bobert. Leave the A and D alone. What I do is actually not DADGAD -- I raise the G to G# and lower the B to A and the high E to D. This creates a good open chord which can be bar'd any where and which is open to all sorts of scales and sliding couplets up and down.

The basic chords in this tuning are:

D: 000000
G: 020120
A 002012
Bm:020020

Regards,

A