Vrho- I wouldn't advise updating fuses , that is a huge fire risk ,
If your wiring is rated to 10amp and you've put 30amp in it your just going to melt your loom,
As it's pulling 15-30amp I would be disconnecting components that use that fuse to diagnose that before it's too late .
I had similar faults but my interior lights stopped working too as their on the same fuse as the central locking