Pyrocat-HD exposure compensation

A few hours after I shot a scene on 4x5 using Ilford FP4 I realized that I overexposed it by about 4 stops (forgot to set the aperture). Any suggestions on how much I should consider reducing the development time in Pyrocat-HD, or the dilution, or both, to salvage the image? Is diluting likely to give me highlights that aren't so blocked up?

Thanks.

This is where you should give divided development a try. It compensates extremely will. I have shot 4x over on purpose just to see how it went. You should give it a whirl.....

I'd suggest you shoot another sheet the same way and try normal to see what happens. If needed shoot another and try 1 minus. if needed another minus 2. ...

FWIW -- I went with 200:1 rather than 100:1, and about 75% of the normal time. Came out looking pretty normal.