Where I grew up they're everywhere and alot of them are way too big and solid to attempt going over without coming to a complete crawl. I made that mistake once... I hit one at 35kph and all my friends smashed their heads against the ceiling of the car... I wasn't too popular...
Where my Dad lives now... His suburb is known as humpville and he lives on a steep street covered in speed bumps so you can't gain or make use of any momentum at the bottom of the street to help you get part way up the hill. Constantly wasting gas and revs just to get home everytime. Most of the time they're in places where there are no/very few alternative routes!! Very frustrating. I wish I could give advice but it sounds like you're doing everything as best as possible.
I think in New Zealand speed bumps are a whole lot more serious than the smooth raised strips and bumps that I drive over here in Canada!!
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