MSD Digital E Curve help

Just Fitted Ede Rpm heads , Had Auto Sparky Check My Electrics , Found earthing Issues or Should I say The Lack of A Good Earth Have Remedied That Problem Now I Can Start Again Setting The E curve Up. With Alloy Heads Do I Need less Timing ??? Another Question If I lock out the Curve does it matter Which Dial Iput the 1 and the 7 Thanx