I had a similar experience in building my Coho -- concentrating on the small picture too much. In my next boat, I'd snug all the wires very loosely and then carefully check the evolving shape of the hull. Then I'd gradually tighten wires while continuing to back-check to make sure the hull shape is fair. As far as epoxied seams giving way, that isn't a problem -- even if you have some space in the joint the second coat will fill it in without problem.

I built mine with many wires very tight and close. particularly at those
> pointy ends, where the wood was very determined to pop apart. In some
> areas, I had trouble with the wires ripping out, and restitched those
> areas by either using more wires, or setting back further into the wood,
> or both. In other areas the panels were inherently tight, so the wire was
> there more for procedure then tension.

> My only substantial mistake was to blithly snug up all my wires, somehow
> forgetting that my panels were not shaped perfectly. I even managed to
> miss this up through glassing the hull. It wasn't easy to miss, but I did.
> In hind sight, and for a second boat, I'd adjust tension as needed in
> areas, leaving gaps, to better fair the lines of the boat. The results are
> not horrible, but instead of smoothly flowing chines, I have somewhat wavy
> chines.

> When I cut the wires, at no point did anything ever move, crack, or pop.
> My internal fillets were excessively large too. I really could have gone
> smaller and followed manufacturers recomendations, I just didn't quite
> believe it at the time.