Sgt_Kickaxe - 9:19 pm on Feb 3, 2012 (gmt 0)
Sorry for the experience, Frost_Angel, always make small changes or use test pages to try something major and wait long enough to know how it affects your site. Wholesale changes, of any kind, are always a crap shoot because of Google's ultra-secrecy policy.
I have removed the site name from titles without problem, and moved it from the start to the end on other occasions without losing any traffic. I have been able to add words as well, the problem seems to happen when you remove a keyword that the page previously ranked for. It would seem that Google 'resets' the page as if brand new when keywords go missing.