Can't get an app (UCCW) to forget custom widgets I made for it, after reinstall

This problem could be the app, the launcher I use (kk launcher) or something I did. When I try to add the widget for uccw, the launcher presents me with several widget options (1x1, 1x2, etc). The launcher freezes on this options screen and I suspect it's because I made additional custom widgets under the uccw category. I also modified existing uccw widgets. Anyway when I reinstall the app, I want it to forget all previous custom widgets and just include the stock widgets made by the app. How can I do this? I already tried clear data and clear cache before uninstalling, then running a search in file explorer and deleting all references to uccw. Didn't work, the extra / altered widgets still show after I reinstall the app.