Adam, swings and roundabouts with the fx, when it drops in value only appropriate to offset with price increase.
On the other side of the coin worth ramping up marketing efforts in the US as cheaper for them!
Also an idea is to offer additional services and products during the check out process, ie offer bone nuts, fret jobs, Dingotone etc.
On stocking non standard kits this is a tricky one, maybe special order as previously suggested. It's a fine balancing act between holding slow moving stock and tyeing up cash vs availability and diversity of offerings.
Seems PBG is the market leader with others following so worth leveraging on this! Customers are generally happy to pay a premium for exceptional customer service and support.