Felt IA disc

Hi, just had a 32 cassette added to the bike but still finding it impossible to spin up a 16-18% climb on it. Went from a 30. Do I now need a 34 for Ironman Bolton as it has more elevation than Wales? Sometimes up a steep section you just want to spin your legs but I can't on this bike. Have to really grind up it or stand up even in the lowest gear.

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