120 Edge Density Problem.

I am consistantly having problems with too much edge(outer 10%) density in my negatives. Problem appears to be independant of developer, camera, and film. I suspect the problem is in agitation but am at a loss how to correct. The tank I develop in holds three and a half (three 120's and one 35mm) reels. Is this normal - some photographers tell me that you should expect some density increase towards the edge of your negative. What I see seems excesive though. I have to DOUBLE my exposure time on the edges of my prints just to get them even left to right! Could the problem stem from turbulent flow of developer as it passes reel wires? Absolutely any help would be appreciated.

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