Sorry, I learned this decades ago. You can't make a piece of electronic gear do what it can't do. Frequency correction isn't going to make an 18 inch woofer into a tweeter if you get my drift. Same thing for a phono cartridge. There are electromechanical limitations.
Practicality of reversing frequency response curve of phono cartridge / stylus
Burning question regarding phono cartridges and wondering how much this has been explored:
How practical would it be to measure a phono cartridge's frequency response with a test record and then correct it with a digital signal processor to be ruler-flat, much like Genelec's GLM system does with a room? Does anyone offer a product that would do this? It seems that rather than spend thousands on a fancy cartridge, one could get by with an average cartridge and correct it with some rather simple processing (?)
My future plans are to use a CEDAR Cambridge processing system to archive the best examples I can find of early jazz music, and I'm forced by the nature of the records and the cartridges available to use a Shure V-15 VX with aftermarket 78-specific stylii, so I'm thinking it might be possible to correct for some of the imperfections of the cartridge if I have a baseline.