There are (2) adjustment points on that slide. One is the "feet" of the ram, the other is the "timing mechanism" which is probably the one you want.
If you run the slide all the way out, where the slide ram enters the unit...there is a cylinder (looks a silencer for a gun) with a bunch of holes in it. Remove the bolt that is in one of the holes, push it in about 1/2" (whatever the gap is) and put the bolt back in to the closest hole. When the slide comes in, that side will then come in more.
I had a unit out here, but now its gone. I'll try and get some pictures if that cylinder is not obvious.
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