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I am certainly not a collimation expert, there are people on here who know far more than I do. But as I understand it, what you are really talking about is the size of the secondary mirror. Obviously if you put a larger secondary in you would see the space surrounding the image of the primary. If you get a larger secondary it has 3 effects. Firstly it will block some of the light reaching the primary, making the overall image slightly less bright (a negative). Secondly it will slightly reduce the amount of contrast in images (a negative). Thirdly it will make the area of 100% illumination at the focal plane larger (a positive).
Odds are that none of these effects would be visible or detectable anyway unless it was a much larger secondary so I wouldn't worry about it.
If you can see all three mirror clips while using the collimation cap then I reckon all is good.
Cheers
Malcolm
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