Campagnolo 10 speed on hills:
I would try a 13-29 cassette. It's supposed to be outside the range that the derailleur can handle, but I've never seen a report of it not working. You can get Veloce and save some money. I assume you have a 50 & 34 chainrings on the front?

I got a 13-29 for some big mountain rides, but I decided to keep it on the bike for my local riding. A 50-13 high gear limits the top end pedaling speed to about 32-35 mph, but I just coast down steeper descents anyway.

The 34-29 low is pretty good for most steep hills. I can climb 8% grades sitting down, and 12+% grades are a lot easier than my old 34-25 low gear.

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Campagnolo chains. They really do last a long time. I use the Wipperman Connex 10-speed quick link. I can take the chain apart for occasional full cleaning, but the main advantage is avoiding the fussy special pin to put the chain together.