I have tired that way, reversed etc.  I'm just running out of ideas. The only way to mine is if I disable that 2gb video card, if I use the code below and disable the 2gb video card it mines perfectly.  As soon I enable the 2gb card I get the DAG error.  Maybe its time to run a second mining program, I wish DAG file didn't have to be on the video card and can be put on a secondary SSD drive or current SSD drive.

set GPU_FORCE_64BIT_PTR 0
set GPU_MAX_HEAP_SIZE 100
set GPU_USE_SYNC_OBJECTS 1
set GPU_MAX_ALLOC_PERCENT 100
set GPU_SINGLE_ALLOC_PERCENT 100

EthDcrMiner64.exe -epool us1.ethermine.org:4444 -ewal ****  -epsw ****  -tt 68 -allpools 1 -di 123 -dcri 15 -mode 0  -dpool stratum+tcp://dcr-us.coinmine.pl:2222 -dwal ***** -dpsw **** 
pause