Is it just me, or do the nasal vowels feel way different than in Portuguese?

I’m a false beginner moving over from Portuguese, and I keep tripping up on the phonetics. I feel like my brain wants to default to Portuguese nasalization, but the Galician sounds are much more subtle. How do you guys stop the 'Portuñol' slip-ups during conversation practice, and are there specific drills to isolate these sounds?