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[Scatty]

Wow, that ISO version sounds like a very easy one. I never played it, so I always thought Wizardry VII is as it is with the Archives version. I had also many years ago Wizardry VII bought in a box on more than one floppy (don't remember now how many), it was pretty much the same as the Archives version. Lost it later, hence why I bought The Ultimate Wizardry Archives after that.

Are you sure you played both versions on the same difficulty? Easy and Hard play quite a difference as far as I know, you can set it in the options.
If it was on the same difficulty I wonder what kind of version that ISO might be. Pretty interesting.
Though rolling highs at 20 and more IS supposed to happen very rarely no matter the difficulty, so there might be something wrong with it.