The 91 set cured me in regards to Topps variants.
After that I stuck to catalog or PSA recognized variations. I did originally start doing Heritage variations but quit that after 2011 because it got ridculous
Because I did variants for my Topps sets 48 and 51 to 91, Bowman 48 to 55, Fleer 59 to 2007 ( there are whole lot of Fleer baseball related sets from 63 to 80 with a boatload of variants), I ran out of gas.
Also did all the Conlon sets 83 to 95 and their variants and prototypes.
I needed better more limited parameters way back when
Starting to wrap up now