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Darrell,
while I have very limited time with an OAG, you have experienced the frustrations that seem to drive everyone to a separate guide-scope.
#1, the FOV may not be the same, but it shouldn't matter, as they are for differing purposes anyway. As long as you can find a star in the off axis bit, then all is well.
#2 though is as it should be. The on axis (camera normally) will see an entirely different area of sky, as it should, as the pick off prism for the off axis section is way off to one side. Again not an issue, just find a star.
#3, the focus. Yep, it will test you for sure. Can I suggest you set the gear up during the day, and point the scope/camera towards a distant power pole or similar. Then get both into focus. You may find you need to work it out by looking at it carefully. The distance from pick off prism to chip needs to be the same as pick off prism to guiding eyepiece of guide camera chip, if you get what I mean. It could mean trying the FF/reducer in front of the OAG unit. Trail and error is really the only way, and this is always simpler during the day.
I am sure that there are plenty on this forum that use an OAG, tap into them, they will have experienced all that you are going through at the moment.
Gary
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