hey ray
dont know what you mean by(measured the repeatability) but the way I do my part is basically I use one tool to set my X,Y, AND Z and that tool sets all my other tools
thats because I set them all up to the same Z as my first tool setter, (first tool) and basically when I run my program and I use multiple tools it works very acurate , but I must say I never move or losen the drills stops they are set pemanatly. even though I can readjust them if I had to.