About EGR switch, on this ECU there is a switch ,not so hard to find, but address is 726DD(value 1 in 8 bit, must to change to 0)
Would be better to try to find yourself.
ecuedit(administrator)have a very nice and useful post about how to find EGR Switch.
egr-switch-edc15c2-t31769B8- (duration map)
76C88- (duration map)
7456E iq limiter - 12x1
About how to tune correctly your file,just need to use the "search" button.For this ECU can find o lot of information in this forum.(25 page full of information)
Read also EDC15 tuning guide, is not for your car, but can help you.
post2417#p2417I am sure , if you read and learn enough to change your file better than the last,you will find more help from this forum.