The extra pin that was there before was old methods of install and cause power to be always on X-Chip or any other modchips. No damage can occur from using it.
Have you tried loading evox 1.0 for 1.6's?
Also you may want to scrap the D0( actual LFRAME ) on xbox and verify connection.
Also verify your XCHIP is pushed all way down and secure and you wire to proper D0 and + 5V ontop of X-Chip.
Also, have you tried with X-Chip out and see if xbox works?
I did a install on a 1.6 this monring using the guide and up and running, used Evox 1.0 for 16 ( full16.bin ) file. Only think is I can point out is make sure D0 is only touching the one spot , real tight there and someon coudl actually solder more then 1 spot and not know if they are not good solderer.