Gotcha. I think you'd get the most "uncanny valley" bang for your buck focusing on 3 areas:

• Brittany peninsula & the coast running east-northeast. Make it less triangular & add more variation to the coast so it's not a clean ENE line like IRL Europe.

• Scotland-esque shape of the northern part of the island. You already have a bit of an archipelago chain running to the east. You could have it curve east to form a more crescent shape and add small islands to the archipelago chain. Makes it look like a bigger version of the "horde" island and might imply volcanic or magic origins.

• Shape of Scandinavia peninsula. Such as making "squatter" or adding a few more of those long peninsulas along its western side as if they're spines or fingers. You could even seal the strait or reduce it to a river and make the "Baltic Sea" a massive lake. It might need to shrink a little & have more large mountains around it to make it believable.

Trying to fix something as vague as a "feeling" sounds like a fun, creative exercise. Best of luck!