Contrast problem with TechPan

Hi all, I am quite new to developing my 35mm negs. I have had phenomenal luck with APX100 and Delta100; using specified times I usually end up with a full range of contrast and none-to-very-few blown-out highlights. BUT...I am most interested in limiting grain as much as possible in my pictoral applications...even in 8x10. I just processed my first roll of TechPan, rated at ISO25, metered the way I always meter. I processed it in Technidol at 68 degrees for 7 1/2 minutes (the time reccomended by someone who uses TechPan successfully). What I ended up with were quite flat negatives, all the info is there, but "squished" into mostly middle grays; the negs needed an Ilford #4 contrast filter and still don't quite look right. My Question Is: If I increase the development time, will this increase the contrast (such as happens when developing a print, where the blacks get blacker over time)? Should I do everything else the same next time, but extend to maybe 9 minutes in the Technidol? Thanks All. I hope I have asked this clearly...Shawn

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