My first impression would be to adjust the tail of the cage to just clear the large ring during shifting (so it doesn't bind up). Start with the rear of the cage just a little "towed in" from parallell with the chain rings. Given that nothing has changed, I would assume that your derailleur setup worked in a similar position on the old crankset. It is possible that your shifting problems are the result of the cable tension and limit stops rather than the cage height. It may be that your "chain line" is slightly different with the new crankset requiring new derailleur adjustments.
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