Back ache

<a href="http://www.ntsearch.com/search.php?q=People&v=55">People</a&gt; - did my furthest ride yet - 75 miles yesterday
ok i was fairly tired but my lower back gave me the most hassle

rode a specialised allez sport so expected comfort but i'm getting the feeling my saddle was too far away from the brake hoods so i was stretching too far perhaps.

broke the basic rule of adjusing just before the ride - stupid i know
i had the same problem on a previous bike years ago and cured it by adjusting the forward / back position of the seat but can't remember which way i went.

Anyone have any simple advice for me or shared the same pain??