Do you have any particular concerns in regard to your functioning in life? If not, I'd probably not worry about the difference in the verbal and performance scales.
In regard to the version you were given, are you sure it was the WAIS-R, not the WAIS-III? The "R" version is very old. It was released in 1981, at least in the U.S. Version III came out around 1997 and version IV in 2008, again in the U.S. I do suspect that the results would be somewhat inflated if you were given a version that is two versions outdated, but with scores as high as you got, it sounds like there are good odds that you are gifted either way, just maybe not as highly as the test you took might indicate.
The adult versions of the Weschler tests don't have alternate ways of calculating the full scale IQ when there are large discrepancies, such as yours, but you are correct that the FSIQ is less reliable when you have big gaps between indices.
