Try making your styles a child style of the default style!
Without knowing which styles you are using it hard for me to give you any advice!
Sometimes if your templates are close in design you can revert common templates like navbar, memberinfo and postbit! These are the ones that get the most edits! copy and paste the code to an editor then revert it. take a peek and if you dont like it then paste the original code back! It may take some time but it will be worth it! I have got all of my styles running on reverted to default on the mentioned templates and it its GREAT when I only have to edit one parent style!! :wow:
BTW, if you install a new skin... and you have a universal header, sometimes you can revert the entire template. If its fixed it will likely move to fluid... If you dont like it after the revert you can always reimport the styles xml and over write the old one

.. I suggest trying to break it!! lol thats the best way to learn! You can do no wrong as long as you leave your default one alone