Im shooting a MBG accent 3 pin on the 4" dovetail slider. It has the smaller housing. When I moved from the 5 pin fixed copper john head to this I did not have to move the peep.
I use the bottom pin (my 40 pin of the 3 pin 20/30/40 set up as the slider. I have the 30 yard pin darn near smack in the middle of the housing. I can get about 90-92 yards out of the pin slider before I run into fletch contact (axis 340 and blazers). This is with a 429.5grain arrow. I ran the adjustment almost all the way up to the top then set the gang adjust height to where the 30 pin was pretty much on bit within 3-4" high, then then moved the pin down itself to fine tune. then I set the 20 and 40. 40 is my "trick pin" and slider. Reason I set the 30 pin is because I wanted it in the center of the housing and that is my (dead even) most stable shot. Found this out kinda by accident when I was blind drawing eyes closed. Come to find out, the 30 pin on that 5 pin set up was usually near the bullseye on a 20/30 yard target. So naturally it FELT the most stable had the best float and all.
I shoot 27.5" draw with a 2014 carbon spyder turbo 63-65#.
Note too that your total arrow weight will play a BIG factor in the slider depth that you can shoot at. An arrow at 460+ grains you might not get to 85 with one unless you shoot a high peep/low anchor, which is for the most part unstable as far as anchor goes.