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Well done!
I think with collimation you just have to bite the bullet first time and do it.
Collimating with a laser collimator is a simple procedure:
1. center the laser on the primary by adjusting the secondary.
2. center the return beam in the collimator by adjusting the primary.
For most, this is usually good enough!
If you use a cheshire collimator as well (step 3) to fine tune, the procedure is a little more complex but none-the-less fairly straightforward. Explaining the procedure is more difficult then the doing.
Coma to the outer field is an inherent problem with fast mirrors at low powers and won't be solved by collimation.
Regards, Rob.
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