Philippe,
Whenever I put a new telescope on my G11, I use the MI-250 limits, which are the most conservative at 95 and 92 degrees. If I see there is more room for the camera end to go, I will increase until I can get the widest angle. Currenly I am using 98 and 98, and Western GoTo Limit = 0, for a 100mm refractor.
But it is not the safety limits that will affect how accurate you are after a meridian flip. In some situations, the limits might stop the flip from occuring at all if you violate the Eastern Safety Limit angle.
Getting back to the same place in the sky is more related to tripod stability, mount leveling, polar alignment, and doing a proper star alignment model. A good plate solving program like ASTAP or Plate Solve 2 should get you back on target after the flip to do more imaging.?
I hope I have answered your question.
John
