Hello @Minely, welcome to qiime2forum.
I just trained a V3-V4 (341F-806R) SILVA-138.2 classifier on qiime2 2025.4, following the RESCRIPt tutorial [Processing, filtering, and evaluating the SILVA database (and other reference sequence data) with RESCRIPt].
I published it on GitHub along with the fit and taxonomy evaluations visualizations.
I'm no expert at all in classifier-training, but you can check it out if you think it could help you.
The classifier repo is GitHub - tripitakit/qiime2classifiers.
Hth.