jefnvk, Your 7S rear gearing leads me to suspect that you have a freewheel hub.(?) This configuration is known for bending and even breaking axles. I do suggest using a freehub design. If upon tear down the axle is good, there's probably little urgency to replace. I would replace the freewheel hub prior to Iceland's tour, however.

I have nearly the same gearing on my beater/touring bike (24-34-42/11-28) and it works well for touring, well enough for you to decide if you want something different.

Brad