Looking for a CX bike that can handle steep climbs

I currently have a trek crossrip elite, and when I go up really steep grades I can hear a creaking noise coming from the frame. It's an aluminum frame, but I'm just wondering:
1. Is it typical for a CX bike to not do so well (i.e. have a noise coming from the frame) when going up steep grades (> 6%)?
2. If it's not typical, what would be some good CX bikes for going up steep grades?
1. Is it typical for a CX bike to not do so well (i.e. have a noise coming from the frame) when going up steep grades (> 6%)?
2. If it's not typical, what would be some good CX bikes for going up steep grades?
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