I've just checked web sites of two well known Chinese carbon wheel manufacturers (both offer frames as well). For a frameset, they quote shipping costs from mainland China to USA of $76 and $92. I think they use EMS.

For a Croz Blade frameset, Culprit web site calculates the minimum shipping rate of $291.

Unless shipping from Taiwan is so much more expensive than shipping from mainland China, there's substantial room for improvement.

Also, just from marketing / customer experience point of view, since you end up charging $300 shipping fee to pretty much every customer, I think it would be better to absorb that fee into the retail price of the product. Instead of listing a frameset for $1800 and then hitting the customer with what's perceived as a large fine-print hidden fee just before checkout, make it $2100, clearly advertised with free shipping.

BTW, the "buy now" link at Culprit Croz Blade - Frameset is broken. (It points to /products/culprit-croz-blade, and it should point to /products/culprit-croz-blade-frameset.)