Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

Got some pictures will post them in just a minute but I just stopped at work after setting the t slot to be a square, and timing is still the same at about 18. My idle is super high, was at 1200 when I was driving and it dieseled like crazy when I shut it off. Should I back off the timing slightly? If I close the idle it won’t show any t slot anymore, and it’s backed off basically all the way. To show the t slot it’s half a turn once the screw contacts the arm