That's because out of the entire helmet the hardest thing to fit correctly is the cheeks especially on a bucket build, however, if you flip the left side to the right side after the cheeks are cut they'll fit the openings so much easier because the curve is already going with the flow of the buckets. Basically you trace your patterns onto the bucket, cut them out, take the left cheek and flip it so it is now the right cheek and vice versa. Keep the lower flat part on the side they started on but the curved part switches. Also start at the back of the cheek aka the flat spot and glue that in and then work the curve. Fiberglass once it's done will save you additional strain if you accidentally drop it.