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spiral scan bottom to top

i have an ID cylinder that is cut at an angle leading to some irregularities in how round it is at the very top. It is one of a set of three cut the same way. We are getting position results on this one hole that do not match the others which should be nearly impossible because of how those are drilled. f Is there any way to force pc-dmis to start its spiral cylinder scan at the bottom of the hole and move up? All other settings are right (vector, depth, ending offset, etc) This way I can start as deep as possible without bottoming out or shanking out and stop before the top irregularities?
Thanks!