I think you will find that both FP4 and HP5 work well with Xtol developer. 1:2 is recommended but if you want more punch (read contrast) try 1:1 or straight. 
Bob Schramm
Check out my web page at: 
 
http://www.SchrammStudio.com 
also look at: 
http://www.wlsc.wvnet.edu/www/pubrel/photo.html 
>From: christine 
>Reply-To: alt-photo-process-l@sask.usask.ca 
>To: alt-photo-process-l@sask.usask.ca 
>Subject: Re: HP5 and fog 
>Date: Fri, 20 Jul 2001 09:37:56 -0400 
> 
>Dave Rose wrote: 
> 
> > This may be a silly question, but is the film fresh? I've used HP5 for many 
> > years. If stored at room temperature, it will acquire increasing levels of 
> > base fog over time. 
> > 
> > I've had very good results using D76 with tray development. 
> > 
> > Dave in Wyoming 
> > 
> > > Has anyone successfully tamed the high base fog level of HP5? I have 
> > tried 
> > > many times to develop this film with conventional developers and found the 
> > > fog level bothersome. 
> 
>That's interesting. I tried HP5 a couple of times a while ago and was 
>disappointed with the results. At the time, I felt the film was strangely flat 
>and lacking punch. Maybe what I was actually seeing was an uncreased base fog 
>and didn't know it. The film was quite fresh. I went back to Kodak after 
>that. 
> 
>-christine 
>