It might help to put the code in the pastebin and indicate which parts you changed after migrating to the better GPU
i dont have access to my code right now but from what i can recall, i changed the accelerator='gpu' and devices=[1] (we have multiple GPUs) in the Trainer object of pytorch lightning. also some misc stuff such as calling .numpy() on the Tensor objects but i think that's mostly it. i kinda thought one of the points about using lightning was the easy transition from cpu to gpu :/