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I agree with Joe, collimation should not have the effect you have described.
It sounds like something else.
There have been a number of similar instances of this reported recently and they have turned out to be a result of having the 1.25 inch eyepiece adaptor attached to the 2" eyepiece adaptor, then an eyepiece.
Please check that you do not have both attached, as the 1.25 will fit into the 2" and look like it is supposed to be that way.
Then, stick with the 25mm eyepiece and move the focus in and out all the way until you achieve focus on your object.
A quick way to check you collimation is to point to a bright star, and defocus and you should get nice concentric airy rings.
However, with the amount of moisture in the air, there mat be some atmospheric disturbance which may prevent it looking perfect.
hope these hints help.
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