Below is a link to a posting on this forum with cross sectional views to help you decide the best course of action.http://www.hobiecat.com/community/viewtopic.php?f=15&t=11944
The epoxy bedding is something I have not done. But in my view, it does not address axial hull twist. It would be very effective at maintaining squareness guarding against oscillations in the flat plane. But if the end castings are not rigidly secured to the hull, the hulls will twist regardless of how well the epoxy bedding was done. To see my point, mentally assemble an epoxy-bedded boat without end castings, then try flying a hull - disaster; both hulls fold under the trampoline. So a less extreme example, say the castings are installed but slightly loose able to move up and down by(.015"), in a year they will work loose to .050, two years .125, and five years .375. The bedding may slow this process, but does not prevent it.
I am assuming that if one is going to install bedding there is a loose casting problem. Before bedding, I prefer a wool and resin fix at the casting pocket. Or better yet, a 7/16 stainless bolt, as illustrated in the above post, which is strong and adjustable (just like the FX1 and H18)