Did this for tfin/50 after having kicked out some typos (missing semicolons, op == 0 twice written, double time derivation showed somehow up as Transpose[]), it finally run as seen in the picture, giving a sea of zeroes ...
each second it took around 10 MB of RAM, here there are only 8 GB RAM, so I had to shorten tfin.
Possibly you find now an error in my editing which caused the solution staying trivial ... good luck!
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