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It sound to me that you have changed the distance from the secondary to the eyepiece. In this case you would need a larger secondary as the cone has to be larger at the base to come to focus within your eyepieces.
I thought about doing the exact same mod but chose not to because I was lazy and put it in the too hard basket.
Try a larger secondary using the following formula, it will give you a fairly good idea of the size necessary.
eg. Main Mirror Diameter 200mm (8")
Focal Length = 1000mm
Height of Focuser = 70mm
Outside Diameter of Tube = 230mm divided by 2 (half) = 115mm
Total distance from Secondary to Eyepiece = 70mm + 115mm = 185mm
Formula
eg. 200mm divided by 1000mm times 185mm = 37mm diameter Secondary Mirror.
Good luck
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