Pan-F in Beutler

After a search for a time for Pan-F in Beutler, all I can up with is 1+1+8 for 4.5 min. That sounds a bit short to me and I'd like to do something longer. Is this a favorite combo for anyone out there in APUG-land and can you share your dilutions, times and other info?

Thanks.

5 min. presoak. 1:1:13 @ 75 deg. for 10 min. Beautiful!